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19 février 2011 6 19 /02 /février /2011 14:00

Windows Internet Explorer (formerly Microsoft Internet Explorer; commonly abbreviated to IE or MSIE), is a series of graphical web browsersdeveloped by Microsoft and included as part of the Microsoft Windows line of operating systems starting in 1995    (Dell XPS M1210 Batteryhttp://www.hdd-shop.co.uk .

It was first released as part of the add-on package Plus! for Windows 95 that year. Later versions were available as free downloads, or in service packs, and included in the OEM service releases of Windows 95 and later versions of Windows   Dell Studio XPS 1640 Battery .

IE has been the most widely used web browser since 1999, attaining a peak of about 95% usage share during 2002 and 2003 with IE5 andIE6. Since its peak of popularity, its usage share has declined in the face of renewed competition from other web browsers to 55%, and is slowly trending downward       Dell Vostro 1710 Battery .

Microsoft spent over $100 million per year on IE in the late 1990s, with over 1000 people working on it by 1999.

Since its first release, Microsoft has added features and technologies such as basic table display (in version 1.5); XMLHttpRequest (in version 5), which aids creation of dynamic web pages     Dell KM958 battery ;

and Internationalized Domain Names (in version 7), which allow Web sites to have native-language addresses with non-Latin characters. The browser has also received scrutiny throughout its development for use of third-party technology (such as the source code of Spyglass Mosaic, used without royalty in early versions)  Dell Studio 1555 battery

and security and privacy vulnerabilities, and both the United States and the European Unionhave alleged that integration of IE with Windows has been to the detriment of other browsers.

The latest stable release is Internet Explorer 8, which is available as a free update for Windows XP with Service Pack 2 or later  Sony VGP-BPS13 battery ,

Windows Server 2003with Service Pack 1 or later, Windows Vista, and Windows Server 2008, and is included with Windows 7 and Windows Server 2008 R2. Internet Explorer was originally planned to be omitted from Windows 7 and Windows Server 2008 R2 in Europe but Microsoft later dropped the plans       Sony VGP-BPS13/B battery ,

and instead included a browser ballot screen with the products, allowing users to select a different web browser if they wish.

Versions of Internet Explorer for other operating systems have also been produced, including an embedded OEM version called Internet Explorer Mobilewhich is currently based on IE7      Sony VGP-BPS13/S battery .

Pocket Internet Explorer, later rebranded Internet Explorer Mobile, which is made for Windows Phone 7, Windows CE, and previously Windows Mobile, remains in development alongside the more advanced desktop versions. Internet Explorer for Mac and Internet Explorer for UNIX (Solaris and HP-UX) have been discontinued  Sony VGP-BPS13A/B battery .

he Internet Explorer project was started in the summer of 1994[citation needed] by Thomas Reardon, using source code from Spyglass, Inc.Mosaic, an early commercial web browser with formal ties to the pioneering NCSA Mosaic browser. In late 1994, Microsoft licensed Spyglass Mosaic for a quarterly fee plus a percentage of Microsoft's non-Windows revenues for the software  Sony VGP-BPS13B/B battery .

Although bearing a name similar to NCSAMosaic, Spyglass Mosaic had used the NCSA Mosaic source code sparingly.

Internet Explorer 1 made its debut on August 16, 1995. It was a reworked version of Spyglass Mosaic, which Microsoft had licensed, like many other companies initiating browser development, from Spyglass Inc  Sony VGP-BPL9 battery .

It came with Microsoft Plus! for Windows 95 and the OEM release of Windows 95. It was installed as part of the Internet Jumpstart Kitin Plus!.[11] The Internet Explorer team began with about six people in early development. Internet Explorer 1.5 was released several months later for Windows NT and added support for basic table rendering     Sony VGP-BPS13B/B battery .

However, by including it for free on their OS, they did not have to pay royalties to Spyglass Inc., which resulted in a lawsuit and a multi-million USD settlement.

Internet Explorer 2 was released for Windows 95, Windows NT 3.5, and NT 4.0 on November 22, 1995 (following a 2.0 beta in October). It featured support for SSL, cookies, VRML, RSA, and Internet newsgroups       Sony VGP-BPL15 battery .

Version 2 was also the first release for Windows 3.1 and Macintosh System 7.0.1 (PPC or 68k), although the Mac version was not released until January 1996 for PPC, and April for 68k.Version 2.1 for the Mac came out in August 1996, although by this time, Windows was getting 3.0        Dell Inspiron E1505 battery .

Version 2 was included in Windows 95 OSR 1 and Microsoft's Internet Starter Kit for Windows 95 in early 1996. It launched with twelve languages including English but this expanded to 24, 20, and 9 for Win 95, Win 3.1, and Mac respectively by April 1996. The 2.0i version supported double-byte character-set        Dell Latitude E6400 battery .

Internet Explorer 3 was released on August 13, 1996, and went on to be much more popular than its predecessors. Internet Explorer 3 was the first major browser with CSS support, although this support was only partial. It also introduced support for ActiveX controls, Java applets, inline multimedia, and the PICS system for content metadata  HP Pavilion dv6000 Battery .

Version 3 also came bundled with Internet Mail and News, NetMeeting, and an early version of the Windows Address Book, and was itself included with Windows 95 OSR 2. Version 3 proved to be the first more popular version of Internet Explorer, which brought with it increased scrutiny      SONY VAIO VGN-FZ Battery .

In the months following its release, a number of security and privacy vulnerabilities were found by researchers and hackers. This version of Internet Explorer was the first to have the 'blue e' logo. The Internet Explorer team consisted of roughly 100 people during the development of three months     SONY VAIO VGN-FZ18 Battery .

The first major IE security hole, the Princeton Word Macro Virus Loophole, was discovered on August 22, 1996 in IE3. Backwards compatibility was handled by allowing users who upgraded to IE3 to still use the last IE, because the installation converted the previous version to a separate directory     SONY VAIO VGN-FZ21E Battery .

Internet Explorer 4, released in September 1997, deepened the level of integration between the web browser and the underlying operating system. Installing version 4 on a Windows 95 or Windows NT 4 machine and choosing Windows Desktop Update would result in the traditional Windows Explorer being replaced by a version more akin to a web browser interface, as well as the Windows desktop itself being web-enabled via Active Desktop  SONY VAIO VGN-FW21E Battery .

The integration with Windows, however, was subject to numerous packaging criticisms (see United States v. Microsoft). This option was no longer available with the installers for later versions of Internet Explorer but was not removed from the system if already installed      SONY VAIO VGN-NR11S/S Battery .

Internet Explorer 4 introduced support for Group Policy, allowing companies to configure and lock down many aspects of the browser's configuration as well as support for offline browsing.Internet Mail and News was replaced with Outlook Express, and Microsoft Chat and an improved NetMeeting were also included      SONY VAIO VGN-NR11M/S Battery .

This version also was included with Windows 98. New features were added that allow you to save and retrieve posts in comment forms which are still not being used today. Internet Explorer 4.5 offered new features such as easier 128-bit encryption. It also offered a dramatic stability improvement over prior versions, particularly the 68k version which was especially prone to freezingSONY VAIO VGN-NR11Z/S Battery .

Internet Explorer 5, launched on March 18, 1999, and subsequently included with Windows 98 Second Edition and bundled with Office 2000, was another significant release that supported bi-directional text, ruby characters, XML, XSLT, and the ability to save web pages in MHTML format      SONY VAIO VGN-NR11Z/T Battery .

IE5 was bundled with Outlook Express 5. Also, with the release of Internet Explorer 5.0, Microsoft released the first version of XMLHttpRequest, giving birth to Ajax (even though the term "Ajax" wasn't coined until years later). It was the last with a 16-bit version     Sony VAIO VGN-FZ21E Battery .

Internet Explorer 5.01, a bug fix version, was released in December 1999. Windows 2000 includes this version. Internet Explorer 5.5 followed in July 2000, improving its print preview capabilities, CSS and HTML standards support, and developer APIs; this version was bundled withWindows Me     Sony VAIO VGN-FW21E Battery .

However, version 5 was the last version for Mac and UNIX. Version 5.5 was the last to have Compatibility Mode, which allowed Internet Explorer 4 to be run side by side with the 5.x. The IE team consisted of over 1,000 people by 1999, with funding on the order of 100 million USD per year    Sony VAIO VGN-NR11S/S Battery .

Internet Explorer 7 was released on October 18, 2006. It includes bug fixes, enhancements to its support for web standards, tabbed browsing with tab preview and management, a multiple-engine search box, a web feeds reader, Internationalized Domain Name support (IDN), Extended Validation Certificate support, and anti-phishing filter  Sony VAIO VGN-NR11Z/S Battery .

With IE7, Internet Explorer has been decoupled from the Windows Shell—unlike previous versions, the Internet Explorer ActiveX control is not hosted in the Windows Explorer process, but rather runs in a separate Internet Explorer process   Sony VAIO VGN-NR11M/S Battery .

It is included with Windows Vista and Windows Server 2008, and is available for Windows XP Service Pack 2 and later, and Windows Server 2003 Service Pack 1 and later. The original release of Internet Explorer 7 required the computer to pass a Windows Genuine Advantage validation check prior to installing, but on October 5, 2007, Microsoft removed this requirement Sony VAIO VGN-NR11Z/T Battery .

As some statistics show, by mid-2008, Internet Explorer 7 market share exceeded that of Internet Explorer 6 in a number of regions.

Internet Explorer 8 was released on March 19, 2009. It had been in development since August 2007 at the latest. On March 5, 2008, the first public beta (Beta 1) was released to the general public  SONY VAIO VGN-FZ180E Battery .

On August 27, 2008, the second public beta (Beta 2) was released. It is supported in Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista, Windows 7, and Windows Server 2008 on both 32-bit as well as 64-bit architectures. Internet Explorer 8 (IE8) RC1 was released on January 26, 2009      SONY VAIO VGN-FZ220E Battery .

Internet Explorer 8 "Final" was released on March 19, 2009. Security, ease of use, and improvements in RSS,CSS, and Ajax support are Microsoft's priorities for IE8. It includes much stricter compliance with web standards, including a planned full Cascading Style Sheets 2.1 compliance for the release version      SONY VAIO VGN-FZ340E Battery .

All these changes allow Internet Explorer 8 to pass the Acid2 test. However, to prevent compatibility issues, IE8 also includes the IE7 rendering behavior. Sites that expect IE7 quirks can disable IE8's breaking changes by including a meta element in the HEAD section of the HTML document         SONY VAIO VGN-FZ430E Battery .

IE8 also includes numerous improvements to JavaScript support as well as performance improvements,  although it still does not pass the Acid3 test, with version 8.0 scoring 20/100. It includes support for Accelerators—which allow supported web applications to be invoked without explicitly navigating to them—and WebSlices—which allows portions of page to be subscribed to and monitored from a redesigned Favorites Bar SONY VAIO VGN-FZ460E Battery .

Other features include InPrivate privacy features and SmartScreen phishing filter.

Internet Explorer 9, currently in development, will have complete or nearly complete support for all CSS 3 selectors including border-radius and many other properties       SONY VAIO VGN-FZ480E Battery ,

faster JavaScript, embedded ICC v2 or v4 color profiles, and hardware accelerated rendering using Direct2D and DirectWrite. Microsoft has confirmed that Web Open Font Format (WOFF) will also be supported. WOFF is "a strong favorite" for standardization by the Web Fonts Working Group of W3C      SONY VAIO VGN-FZ4000 Battery .

Microsoft has continued to downplay the importance of passing the Acid3 test, but speculation that IE9 would support the SVG W3C recommendation was ignited when Microsoft announced they had joined the SVG Working Group. Support for the HTML5 video and audio tags was also promised       SONY VAIO VGN-FZ31E Battery .

Some industry experts predict that Microsoft will release IE9 as a major out-of-band version that is not tied to any particular version of Windows. According to the Internet Explorer 9 Test Drive page, the system requirements for IE9 are Windows Vista SP2 (with Platform Upgrade and IE8) or Windows 7       SONY VAIO VGN-FZ31B Battery .

The final build of IE9 is expected to be released in 2011.

At MIX 10, the first IE9 Platform Preview was released, which featured support for CSS3 and SVG, a new JavaScript engine called Chakra, and a score of 55/100 on the Acid3 test (up from 20/100 for IE8)        SONY VAIO VGN-FZ31J Battery .

On May 5, 2010, the second IE9 Platform Preview was released, which featured a score of 68/100 on the Acid3 test and faster performance on the WebKit SunSpider JavaScript benchmark than the first IE9 Platform Preview. On June 23, 2010, the third IE9 Platform Preview was released         SONY VAIO VGN-FZ31M Battery ,

which scores 83/100 on the Acid3 test and introduced support for<audio>, <video>, and <canvas> elements and WOFF. On August 4, 2010, the fourth IE9 Platform Preview was released, which features a score of 95/100 on the Acid3 test and a faster JScript engine than the third IE9 Platform Preview          SONY VAIO VGN-FZ31Z Battery .

On August 12, 2010, Microsoft announced that the IE9 Public Beta would launch on September 15, 2010 at a special event in San Francisco linked to the idea of 'beauty of the web. It was also confirmed that the browser would only function with Windows Vista and Windows 7       SONY VAIO VGN-FZ38M Battery .

On September 15, 2010, Microsoft launched the IE9 Public Beta, alongside Platform Preview 5. The sixth IE9 Platform Preview was released on October 28, 2010, and includes support for CSS3 2D transforms and HTML5 semantic elements. The seventh IE9 Platform Preview was released on November 17, 2010, and features better JScript performance   SONY VGP-BPS8 Battery .

On February 10, 2011, the IE9 Release Candidate was released, featuring improved performance, a tracking protection feature, a refined UI, support for more web standards, and other improvements      SONY VGP-BPS13/S Battery .

Internet Explorer has been designed to view a broad range of web pages and to provide certain features within the operating system, including Microsoft Update. During the heyday of the browser wars, Internet Explorer superseded Netscape only when it caught up technologically to support the progressive features of the time      SONY VGP-BPS13A/B Battery .

Standards support

Internet Explorer, using the Trident layout engine:

  • supports HTML 4.01, CSS Level 1, XML 1.0, and DOM Level 1, with minor implementation gaps     SONY VGP-BPS13B/B Battery.
  • fully supports XSLT 1.0 as well as an obsolete Microsoft dialect of XSLT often referred to as WD-xsl, which was loosely based on the December 1998 W3C Working Draft of XSL. Support for XSLT 2.0 lies in the future: semi-official Microsoft bloggers have indicated that development is underway, but no dates have been announced       SONY VGP-BPS13A/S Battery .
  • partially supports CSS Level 2 and DOM Level 2, with major implementation gaps and conformance issues. Almost full conformance to CSS 2.1 has been added in the Internet Explorer 8 release.
  • supports XHTML in Internet Explorer 9 (Trident version 5.0). Prior versions can render XHTML documents authored with HTML compatibility principles and served with a text/html MIME-type       SONY VGP-BPS13AS Battery .
  • fully supports SVG in Internet Explorer 9 (Trident version 5.0).

Internet Explorer uses DOCTYPE sniffing to choose between standards mode and a "quirks mode" in which it deliberately mimicks nonstandard behaviors of old versions of MSIE for HTML and CSS rendering on screen (Internet Explorer always uses standards mode for printing). It also provides its own dialect ofECMAScript called JScript       Dell Inspiron 1320n Battery .

Internet Explorer had been subjected to criticism by W3C over its limited support for SVG promoted by W3C.

Non-standard extensions

Internet Explorer has introduced an array of proprietary extensions to many of the standards, including HTML, CSS, and the DOMDell Inspiron 1464 Battery .

This has resulted in a number of web pages that appear broken in standards-compliant web browsers and has introduced the need for a "quirks mode" to allow for rendering improper elements meant for Internet Explorer in these other browsers      Dell Inspiron 1564 Battery .

Internet Explorer has introduced a number of extensions to JScript that have been adopted by other browsers. These include the innerHTML property, which returns the HTML string within an element; the XMLHttpRequest object, which allows the sending of HTTP request and receiving of HTTP response        Dell Inspiron 1764 Battery ;

and the designMode attribute of the contentDocument object, which enables rich text editing of HTML documents. Some of these functionalities were not possible until the introduction of the W3C DOM methods. Its Ruby character extension to HTML is also accepted as a module in W3C XHTML 1.1, though it is not found in all versions of W3C HTML    Dell Studio 1450 Battery .

Microsoft submitted several other features of IE for consideration by the W3C for standardization. These include the 'behavior' CSS property, which connects the HTML elements with JScript behaviors (known as HTML Components, HTC)   Dell Studio 1457 Battery ;

HTML+TIME profile, which adds timing and media synchronization support to HTML documents (similar to the W3C XHTML+SMIL), and the VML vector graphicsfile format. However, all were rejected, at least in their original forms. VML was, however, subsequently combined with PGML (proposed by Adobe and Sun)      Dell Latitude D610 Battery ,

resulting in the W3C-approved SVG format, currently one of the few vector image formats being used on the web, and which IE is now virtually unique in not supporting.

Other non-standard behaviors include     Toshiba NB100 Battery :

support for vertical text, but in a syntax different from W3C CSS3 candidate recommendation, support for a variety of image effects  and page transitions, which are not found in W3C CSS, support for obfuscated script code, in particular JScript.Encode(). Support for embedding EOT fonts in web pages      Toshiba Satellite M65 battery .

Favicon

The favicon (short for "favorites icon") introduced by Internet Explorer is now also supported and extended in other browsers. It allows web pages to specify a 16-by-16 pixel image for use in bookmarks       Toshiba Satellite M60 battery .

In IE, support was, and still is, provided only for the native Windows ICO format; in other browsers it has now been extended to other types of images such as PNG and GIF.

Usability and accessibility

The "quick tabs" feature available inInternet Explorer 8       Dell Latitude D830 Battery

Internet Explorer makes use of the accessibility framework provided in Windows. Internet Explorer is also a user interface for FTP, with operations similar to that of Windows Explorer. Pop-up blocking and tabbed browsing were added respectively in Internet Explorer 6 and Internet Explorer 7       Dell Latitude D620 Battery .

Tabbed browsing can also be added to older versions by installing MSN Search Toolbar or Yahoo Toolbar.

Cache

Internet Explorer caches visited content in the Temporary Internet Files folder to allow quicker access (or offline access) to previously visited pages       Dell Inspiron Mini 10 Battery .

The content is indexed in a database file, known as Index.dat. Multiple Index.dat files exist which index different content—visited content, web feeds, visitedURLs, cookies, etc.

Prior to IE7, clearing the cache used to clear the index but the files themselves were not reliably removed, posing a potential security and privacy risk        Sony VGN-FW11S Battery .

In IE7 and later, when the cache is cleared, the cache files are more reliably removed, and the index.dat file is overwritten with null bytes.

Group Policy

Internet Explorer is fully configurable using Group Policy       Sony VGN-FW11M Battery .

Administrators of Windows Server domains can apply and enforce a variety of settings that affect the user interface (such as disabling menu items and individual configuration options), as well as underlying security features such as downloading of files, zone configuration, per-site settings, ActiveX control behavior and others        Sony VGN-FW139E/H battery .

Policy settings can be configured for each user and for each machine. Internet Explorer also supports Integrated Windows Authentication.

Architecture

The architecture of IE8. Previous versions had a similar architecture, except that both tabs and the UI were within the same process. Consequently, each browser window could have only one "tab process"       Dell Latitude E5400 Battery .

Internet Explorer uses a componentized architecture built on the Component Object Model (COM) technology. It consists of several major components, each of which is contained in a separate Dynamic-link library (DLL) and exposes a set of COM programming interfaces hosted by the Internet Explorer main executable, iexplore.exe:

  • WinInet.dll is the protocol handler for HTTP, HTTPS and FTP. It handles all network communication over these protocols.
  • URLMon.dll is responsible for MIME-type handling and download of web content, and provides a thread-safe wrapper around WinInet.dll and other protocol implementations      Dell Latitude E4200 Battery .
  • MSHTML.dll houses the Trident rendering engine introduced in Internet Explorer 4, which is responsible for displaying the pages on-screen and handling the Document Object Model of the web pages. MSHTML.dll parses the HTML/CSS file and creates the internal DOM tree representation of it        Dell Inspiron 300M Battery .
  • It also exposes a set of APIs for runtime inspection and modification of the DOM tree. The DOM tree is further processed by a layout engine which then renders the internal representation on screen.
  • IEFrame.dll contains the user interface and window of IE in Internet Explorer 7 and above  Dell Vostro A840 Battery .
  • ShDocVw.dll provides the navigation, local caching and history functionalities for the browser.
  • BrowseUI.dll is responsible for the browser user interface, including the browser chrome, which houses all the menus and toolbars       Dell Studio 1737 battery .

Internet Explorer does not include any native scripting functionality. Rather, MSHTML.dll exposes an API that permit a programmer to develop a scripting environment to be plugged-in and to access the DOM tree. Internet Explorer 8 includes the bindings for the Active Scripting engine        Dell Inspiron E1505 battery ,

which is a part ofMicrosoft Windows and allows any language implemented as an Active Scripting module to be used for client-side scripting. By default, only the JScript andVBScript modules are provided; third party implementations like ScreamingMonkey (for ECMAScript 4 support) can also be used            Dell RM791 battery .

Microsoft also makes available the Microsoft Silverlight runtime that allows CLI languages, including DLR-based dynamic languages like IronPython and IronRuby, to be used for client-side scripting.

Internet Explorer 8 introduces some major architectural changes, called Loosely Coupled IE (LCIE)  Dell XPS M1530 battery .

LCIE separates the main window process (frame process) from the processes hosting the different web applications in different tabs (tab processes). A frame process can create multiple tab processes, each of which can be of a different integrity level; each tab process can host multiple web sites        Dell XPS M2010 battery .

The processes use asynchronous Inter-Process Communication to synchronize themselves. Generally, there will be a single frame process for all web sites. In Windows Vista with Protected Mode turned on, however, opening privileged content (such as local HTML pages) will create a new tab process as it will not be constrained by Protected Mode     Acer Aspire One battery .

Extensibility

Internet Explorer exposes a set of Component Object Model (COM) interfaces that allow other components to extend the functionality of the browser. Extensibility is divided into two types: Browser extensibility and Content extensibility  Toshiba Satellite P10 Battery .

The browser extensibility interfaces can be used to plug in components to add context menu entries, toolbars, menu items or Browser Helper Objects (BHO). BHOs are used to extend the feature set of the browser, whereas the other extensibility options are used to expose the feature in the UI        SONY VGN-FZ210CE Battery .

Content extensibility interfaces are used by different content-type handlers to add support for non-native content formats.  BHOs not only have unrestricted access to the Internet Explorer DOM and event model, they also can access the filesystem, registry and other OS components        Dell Precision M70 Battery .

Content extensibility can be either in terms of Active Documents (Doc Objects) (e.g., SVG or MathML) or ActiveX controls.ActiveX controls are used for content handlers that render content embedded within an HTML page (e.g., Adobe Flash or Microsoft Silverlight)       Toshiba Satellite L305 Battery .

Doc objects are used when the content type won't be embedded in HTML (e.g., Microsoft Word, PDF orXPS). In fact, the Trident rendering engine is itself exposed as a Doc object, so HTML in itself is treated as an Active Document   Toshiba Satellite T4900 Battery .

Internet Explorer add-on components run with the same privileges as the browser itself, unlike client-side scripts that have a very limited set of privileges. Add-ons can be installed either locally, or directly by a web site. Since the add-ons have a more privileged access to the system, malicious add-ons can and have been used to compromise the security of the system   Toshiba PA3399U-2BRS battery .

Internet Explorer 6 Service Pack 2 onwards provide various safeguards against this, including an Add-onManager for controlling ActiveX controls and Browser Helper Objects and a "No Add-Ons" mode of operation as well as greater restrictions on sites installing add-ons   Toshiba Satellite A200 Battery .

Internet Explorer itself can be hosted by other applications via a set of COM interfaces. This can be used to embed the browser functionality inside the application. Also, the hosting application can choose to host only the MSHTML.dll rendering engine, rather than the entire browser       Toshiba Satellite 1200 Battery .

Security

Internet Explorer uses a zone-based security framework that groups sites based on certain conditions, including whether it is an Internet- or intranet-based site as well as a user-editable whitelist. Security restrictions are applied per zone; all the sites in a zone are subject to the restrictions      Toshiba Satellite M300 Battery .

Internet Explorer 6 SP2 onwards uses the Attachment Execution Service of Microsoft Windows to mark executable files downloaded from the Internet as being potentially unsafe. Accessing files marked as such will prompt the user to make an explicit trust decision to execute the file, as executables originating from the Internet can be potentially unsafe      SONY VGP-BPS13A/Q Battery .

This helps in preventing accidental installation of malware.

Internet Explorer 7 introduced the phishing filter, that restricts access to phishing sites unless the user overrides the decision. With version 8, it also blocks access to sites known to host malware. Downloads are also checked to see if they are known to be malware-infected    SONY VGP-BPS13A/Q Battery .

In Windows Vista, Internet Explorer by default runs in what is called Protected Mode, where the privileges of the browser itself are severely restricted—it cannot make any system-wide changes. One can optionally turn this mode off but this is not recommendedSONY VGP-BPS13B/Q Battery .

This also effectively restricts the privileges of any add-ons. As a result, even if the browser or any add-on is compromised, the damage the security breach can cause is limited.

Patches and updates to the browser are released periodically and made available through the Windows Update service, as well as through Automatic Updates      SONY VGP-BPS13B/Q Battery .

Although security patches continue to be released for a range of platforms, most feature additions and security infrastructure improvements are only made available on operating systems which are in Microsoft's mainstream support phase  SONY VGP-BPS13/Q Battery .

On December 16, 2008, Trend Micro recommended users switch to rival browsers until an emergency IE patch was released to fix a potential security risk which "could allow outside users to take control of a person's computer and steal their passwords". Microsoft representatives countered this recommendation, claiming that "0.02% of internet sites" were affected by the flaw  SONY VGP-BPS13/Q Battery .

On December 17, 2008, a fix to the security problem above became available, with the release of the Security Update for Internet Explorer KB960714, which is available from Microsoft Windows Update's webpage. Microsoft has said that this update fixes the security risk found by Trend Micro the previous day      SONY VGP-BPS21A/B Battery .

Security vulnerabilities

Internet Explorer has been subjected to many security vulnerabilities and concerns: Much of the spyware, adware, and computer viruses across the Internet are made possible by exploitable bugs and flaws in the security architecture of Internet Explorer  SONY VGP-BPS21/S Battery ,

sometimes requiring nothing more than viewing of a malicious web page in order to install themselves. This is known as a "drive-by install". There are also attempts to trick the user into installing malicious software by misrepresenting the software's true purpose in the description section of an ActiveX security alert    SONY VGP-BPS21B Battery .

A number of security flaws affecting IE originated not in the browser itself, but ActiveX-based add-ons used by it. Because the add-ons have the same privilege as IE, the flaws can be as critical as browser flaws. This has led to the ActiveX-based architecture being criticized for being fault-prone         SONY VGP-BPS21A Battery .

By 2005, some experts maintained that the dangers of ActiveX have been overstated and there were safeguards in place. In 2006, new techniques using automated testing found more than a hundred vulnerabilities in standard Microsoft ActiveX components  SONY VGP-BPS21 Battery .

Security features introduced in then recently released Internet Explorer 7 mitigated some of these vulnerabilities.

Internet Explorer in 2008 had a number of published security vulnerabilities. According to research done by security research firm Secunia, Microsoft did not respond as quickly as its competitors in fixing security holes and making patches available  Sony VGP-BPS21A/B Battery .

The firm also reported 366 vulnerabilities in ActiveX controls, an increase from the prior year.

According to the latest information, Secunia reports that IE6 has 24 known unpatched vulnerabilities, IE7 has 11, and IE8 has 4. The most severe unpatched Secunia advisories affecting Microsoft Internet Explorer 6.x, 7.x, and 8     Sony VGP-BPS21/S Battery .

x with all vendor patches applied, are all rated Extremely critical. The oldest known unpatched vulnerabilities for IE6, IE7, and IE8 date from November 7, 2003, June 6, 2006, and February 26, 2007 respectively    Sony VGP-BPS21A Battery .

According to the latest information, security research firm SecurityFocus reports that IE6 has 396 known unpatched vulnerabilities, IE7 has 22, and IE8 has 25. The oldest known unpatched vulnerabilities for IE6, IE7, and IE8 date from November 20, 2000, May 17, 2007, and April 11, 2009 respectively   Sony VGP-BPS21 Battery .

Internet Explorer has been criticized by one Chris Evan for having a known security vulnerability which could allow information disclosure to remain unfixed for at least 600 days. Microsoft says that it had known about this vulnerability but it was of very low severity as the victim web site must be configured in a special way for this attack to be feasible at all  Sony Vaio PCG-5G2L Battery .

In December 2010, researchers have been able to bypass the "Protected Mode" feature in Internet Explorer.

Vulnerability exploited in attacks on U.S. firms

In an advisory on January 14, 2010, Microsoft said that attackers targeting Google and other U.S  Sony Vaio PCG-5G3L Battery .

companies used software that exploits a security hole, which had already been patched, in Internet Explorer. The vulnerability affected Internet Explorer 6, IE7, and IE8 on Windows 7, Vista, Windows XP, Server 2003, and Server 2008 R2, as well as IE 6 Service Pack 1 on Windows 2000 Service Pack 4   Sony Vaio PCG-5J1L Battery .

The German government warned users against using Internet Explorer and recommended switching to an alternative web browser, due to the major security hole described above that was exploited in Internet Explorer.  The Australian and French Government issued a similar warning a few days later       Sony Vaio PCG-5K2L Battery .

The first browser they recommended was Mozilla Firefox, followed by Google Chrome.

Market adoption and usage share

Source: Median values from world wide summary table.

Internet Explorer (43.8%)

Mozilla Firefox (29.7%; Usage by version number)  Sony Vaio PCG-5J2L Battery

Google Chrome (13.0%)

Safari (6.1%)

Opera (2.2%)

Mobile browsers (4.3%)         Sony Vaio PCG-5K1L Battery

See also: Usage share of web browsers

The adoption rate of Internet Explorer seems to be closely related to that of Microsoft Windows, as it is the default web browser that comes with Windows. Since the integration of Internet Explorer 2.0 with Windows 95 OSR 1 in 1996, and especially after version 4.0's release, the adoption was greatly accelerated     Sony Vaio PCG-6S2L Battery :

from below 20% in 1996 to about 40% in 1998 and over 80% in 2000.

A CNN article noted at the release of Internet Explorer 4: "Microsoft's Internet Explorer has made inroads and various estimates put its share of the browser market 30 to 35 percent from about 10 percent a year ago      Sony Vaio PCG-6S3L Battery .

"  By 2002, Internet Explorer had almost completely superseded its main rival Netscape and dominated the market with up to 95 percent market share.

After having fought and won the browser wars of the late 1990s, Internet Explorer gained almost total dominance of the browser market     Sony Vaio PCG-6V1L Battery .

Having attained a peak of about 95% during 2002 and 2003, its market share has since declined at a slow but steady pace. This is mainly due to the adoption of Mozilla Firefox, which statistics indicate is currently the most significant competition  Sony Vaio PCG-6W1L Battery .

Nevertheless, Internet Explorer remains the dominant web browser, with a global usage share of around 60% (though measurements vary). Usage is higher in Asia and lower in Europe.

Firefox 1.0 had surpassed Internet Explorer 5 in early 2005 with Firefox 1.0 at roughly 8 percent market share   Sony Vaio PCG-6W2L Battery .

An article notes at the release of Internet Explorer 7 in October 2006 that "IE6 had the lion's share of the browser market with 77.22%. Internet Explorer 7 had climbed to 3.18%, while Firefox 2.0 was at 0.69%."

Internet Explorer 7 was released at the same time as Firefox 2.0, and overtook Firefox 1.x by November 2006, at roughly 9% market share   Sony Vaio PCG-6W3L Battery .

Firefox 2.0 had overtaken 1.x by January 2007,  but IE7 did not surpass IE6 until December 2007.  By January 2008, their respective version market share stood at 43% IE7, 32% IE6, 16% FF2, 4% Safari 3 and both FF1.x and IE5 versions at less than half a percent     Sony Vaio PCG-7111L Battery .

Approximate usage over time based on various usage share counters averaged for the year overall, or for the fourth quarter, or for the last month in the year depending on availability of reference.

According to StarCounter, which tracks internet usage data, Internet Explorer's marketshare fell below 50% in September 2010  Sony Vaio PCG-7112L Battery .

Market share history overview by year and version

Approximate usage over time based on various usage share counters averaged for the year overall, or for the fourth quarter, or for the last month in the year depending on availability of reference  Sony Vaio PCG-7113L Battery .

Industry adoption

The ActiveX extension mechanism is used by many public websites and web applications, including eBay. Similarly, Browser Helper Objects are also used by many search enginecompanies and third parties for creating add-ons that access their services, such as search engine toolbars       Sony Vaio PCG-7133L Battery .

Because of the use of COM, it is possible to embed web-browsing functionality in third-party applications. Hence, there are a number of Internet Explorer shells, and a number of content-centric applications like RealPlayer also use Internet Explorer's web browsing module for viewing web pages within the applications       Sony Vaio PCG-7Z2L Battery .

OS compatibility

IE versions, over time, have had widely varying OS compatibility, ranging from being available for many platforms and several versions of Windows to only a few versions of Windows        Sony Vaio PCG-8Y1L Battery .

Many versions of IE had some support for an older OS but stopped getting updates. The increased growth of the Internet in the 1990s and 2000s means that current browsers with small market shares have more total users than the entire market early on   Sony Vaio PCG-8Y2L Battery .

For example, 90% market share in 1997 would be roughly 60 million  users, but by the start of 2007 90% market share  would equate to over 900 million users.  The result is that later versions of IE6 had many more users in total than all the early versions put together   Sony Vaio PCG-8Z1L Battery .

The release of IE7 at the end of 2006 resulted in a collapse of IE6 market share; by February 2007, market version share statistics showed IE6 at about 50% and IE7 at 29%. Regardless of the actual market share, the most compatible version (across operating systems) of IE was 5.x    Sony Vaio PCG-8Z2L Battery .

which had Mac OS 9 and Mac OS X, Unix, and most Windows versions available and supported for a short period in the late 1990s (although 4.x had a more unified codebase across versions). By 2007, IE had much narrower OS support, with the latest versions supporting only Windows XP Service Pack 2 and above       Sony VAIO PCG-5G2L Battery .

Internet Explorer 5.0, 5.5, 6.0, and 7.0 (Experimental) have also been unofficially ported to the Linux operating system from the project IEs4Linux.

* Internet Explorer 6 SP2 is only available as part of Windows XP SP2 or Windows Server 2003 SP1 or SP2  Sony VAIO PCG-5G3L Battery .
** The version of Internet Explorer included with Windows 95 varied by OSR release; 2.0 was included with OSR1, 3.0 was included with OSR2, and 4.0 was included with OSR2.5.
*** No native support, but possible with third-party "Standalone" installer    Sony VAIO PCG-5J1L Battery .
& Final version of Windows XP Service Pack 3 does not include IE7.
$ No native support, but possible with third party Standalone installer of IE6 Alpha. See also Internet Explorer Mobile. Non-desktop versions of IE have supported Windows CE also       Sony VAIO PCG-5K2L Battery .
£ Internet Explorer 2.0 and 2.0.1 requires System 7.0.1 or higher. Internet Explorer 2.1 requires System 7.1 or higher.
€ Included Internet Explorer 3.01 in Mac OS 8.1; Internet Explorer 4.01 in Mac OS 8.5 and 8.5.1; Internet Explorer 4.5 from Mac OS 8.6 to 9.0.4; Internet Explorer 5 from Mac OS 9.1 to 9.2.2       Sony VAIO PCG-5J2L Battery .
¥ Internet Explorer 5 Macintosh Edition requires Mac OS 7.6 or higher. Internet Explorer version 5.1; 5.1.4; 5.1.5; 5.1.6 and 5.1.7 requires Mac OS 8.0 or higher or Mac OS 7.6.1 with Appearance Manager.
16 16-bit version        Sony VAIO PCG-5K1L Battery

"Standalone" Internet Explorer

Early versions of Internet Explorer such as 5 had a compatibility mode to run Internet Explorer 4, though this feature was dropped (also, Internet Explorer for Mac users could still use 4.5 after installing IE 5)         Sony VAIO PCG-5L1L Battery .

While Microsoft claims it is impossible to keep multiple versions of Internet Explorer on the same machine, some hackers have successfully separated several versions of Internet Explorer, making them standalone applications. These are referred to as "standalone" IEs and have included versions 3 through 7     Sony VAIO PCG-6S2L Battery .

  • Multiple IEs in Windows Web Design—The web developer Joe Maddalone who found the solution.
  • Xenocode Browser Sandbox—Xenocode application virtualization.

Microsoft has discontinued standalone installers for Internet Explorer to the general public     Sony VAIO PCG-6S3L Battery .

However, there are unofficial procedures for downloading the complete install package. Internet Explorer standalone uses a feature introduced in Windows 2000 called DLL redirection to force it to load older DLLs than the ones installed on the system  Sony VAIO PCG-6W1L Battery .

  • IE Collection. An installer for the standalone versions of IE8.0, IE7.0, IE6.0, IE5.51, IE5.01, IE4.01, IE3.0, IE2.01, IE1.5, and IE1.0.
  • Microsoft Support document, with instructions for downloading the entire set of installation files.

It is also possible to install Internet Explorer via Wine   Sony VAIO PCG-6V1L Battery .

  • IEs4Linux automatically sets up Internet Explorer 5.0, 5.5, and 6.0 in Wine. Supporting Internet Explorer 7 is currently in development; as of August 2007, the IE7 rendering engine can be used with the IE6 user interface  Sony VAIO PCG-6W1L Battery .

After Internet Explorer 7 is installed, an Internet Explorer 6 executable is still available in C:\WINDOWS\ie7, hidden by default. Launching this executable provides the user with the older IE6 interface, however web pages are rendered using the IE7 engine. The IE6 engine can be re-enabled by placing a file named "iexplore.exe.local" into the IE7 folder  Sony VAIO PCG-6W2L Battery .

As an alternative to using IE standalone, Microsoft now makes available Microsoft Virtual PC images containing pre-activated copies of Windows XP with either IE 6 or IE 7 installed.  Microsoft recommends this approach for web developers seeking to test their pages in the different versions of IE as the standalone versions are unsupported and may not work the same way as a properly installed copy of IE   Sony VAIO PCG-6W3L Battery .

Removal

While a major upgrade of Internet Explorer can be uninstalled in a traditional way if the user has saved the original application files for installation, the matter of uninstalling the version of the browser that has shipped with an operating system remains a controversial one       Sony VAIO PCG-7111L Battery .

The idea of removing a stock install of Internet Explorer from a Windows system was proposed during the United States v. Microsoft case. One of Microsoft's arguments during the trial was that removing Internet Explorer from Windows may result in system instability       Sony VAIO PCG-7112L Battery .

Removing Internet Explorer does have a number of consequences. Applications that depend on libraries installed by IE will fail to function (or malfunction). The Windows help and support system will also not function due to the heavy reliance on HTML help files and components of IE       Sony VAIO PCG-7113L Battery .

In versions of Windows before Vista, it is also not possible to run Microsoft's Windows Update or Microsoft Updatewith any other browser due to the service's implementation of an ActiveX control, which no other browser supports. In Windows Vista, Windows Update is implemented as a Control Panel applet     Sony VAIO PCG-7Z1L Battery .

With Windows 7, Microsoft added the ability to safely remove Internet Explorer 8 from Windows. Microsoft does not allow the dependencies to be removed through this process, but the Internet Explorer executable (iexplore.exe) is removed without harming any other Windows components   Sony VAIO PCG-7Z2L Battery .

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