About Windows 8 (English Version)

Windows 8 is the version of the Microsoft Windows computer operating systemfollowing Windows 7.^[3] It has many changes from previous versions. In particular it adds support for ARM microprocessors in addition to the previously supported x86microprocessors from Intel and AMD. A new Start Screen interface has been added that was designed for touchscreen input in addition to mouse, keyboard, and peninput.

Contents   [hide]  1 History and development 1.1 Early announcements 1.2 Milestone leaks 1.3 Official announcements 1.4 Build conference and developer preview 2 New features 3 Hardware requirements 4 Compatibility 5 See also 6 References 7 External links

[edit]History and development

[edit]Early announcements

In January 2011, at the Consumer Electronics Show (CES), Microsoft announced that Windows 8 would be adding support for ARM microprocessors in addition to the x86microprocessors from Intel and AMD.^[4][5]

[edit]Milestone leaks

A 32-bit Milestone 1 build, build 7850, with a build date of September 22, 2010, was leaked to BetaArchive, an online beta community, which was soon leaked to P2P/torrent sharing networks on April 12, 2011.^[6] Milestone 1 includes a ribboninterface for Windows Explorer,^[7] a PDF reader called Modern Reader, an updated task manager called Modern Task Manager,^[8] and nativeISO image mounting.^[9]

A 32-bit Milestone 2 build, build 7927, was leaked to The Pirate Bay on August 29, 2011 ^[10] right after many pictures leaked on BetaArchive the day before.^[11] Features of this build are mostly the same as build 7955.^[12]

A 32-bit Milestone 2 build, build 7955, was leaked to BetaArchive on April 25, 2011.^[13] Features of this build included a new pattern login and a new file system known as Protogon.^[14]

A 64-bit Milestone 3 build, build 7959, was leaked to BetaArchive on May 1, 2011.^[15] This build is notable for being the first publicly leaked Windows Server 8 build, as well as the first leaked 64-bit build.

A Milestone 3 build, build 7971, was released to close partners of Microsoft on March 29, 2011^[16] but was kept under heavy security. However, a few screenshots were leaked. The "Windows 7 Basic" theme now uses similar metrics to the Aero style, but maintains its non-hardware accelerated design, and also supports taskbar thumbnails. The boxes that encase the "close, maximize, and minimize" buttons have been removed, leaving just the signs.^[17]

A 64-bit Milestone 3 build, build 7989, leaked to BetaArchive on June 18, 2011 after screenshots were revealed the previous day. An SMS feature, a new virtual keyboard, a new bootscreen, transparency in the basic theme, geo-location services, Hyper-V 3.0, and PowerShell 3.0 were revealed in this build.^[18]

[edit]Official announcements

At the Microsoft Developer Forum in Tokyo on May 23, 2011, Microsoft CEO Steve Ballmer announced that the next version of Windows would be released the following year.^[19]

"And yet, as we look forward to the next generation of Windows systems, which will come out next year, there's a whole lot more coming. As we progress through the year, you ought to expect to hear a lot about Windows 8. Windows 8 slates, tablets, PCs, a variety of different form factors."^[19]

However, Microsoft quickly amended Ballmer's words in a statement issued that afternoon:

"It appears there was a misstatement. We are eagerly awaiting the next generation of Windows 7 hardware that will be available in the coming fiscal year. To date, we have yet to formally announce any timing or naming for the next version of Windows."^[20]

On June 1, 2011, Microsoft officially unveiled Windows 8 and some of its new features at the Taipei Computex 2011 in Taipei (Taiwan) by Mike Angiulo and at the D9 conference in California (United States) by Julie Larson-Green and Microsoft's Windows President Steven Sinofsky.^[21][22] The main feature that was shown was the new user interface.

On August 15, 2011, Microsoft opened a new blog called "Building Windows 8" for users and developers.^[23]

[edit]Build conference and developer preview

Microsoft unveiled new Windows 8 features and improvements on September 13, 2011, day one of the BUILD developer conference.^[24]Microsoft also released a Developer Preview build (Build 8102) of Windows 8 for the developer community to download and start working with. This developer preview includes tools for building "metro style apps", such as Microsoft Windows SDK for Metro style apps, Microsoft Visual Studio 11 Express for Windows 8 Developer Preview and Microsoft Expression Blend 5 Developer Preview.^[25]

Microsoft has shown a development roadmap at the BUILD conference stating that the coming milestones will be Beta, Release Candidate,RTM, and general availability.

According to Microsoft, there were more than 500,000 downloads of the Windows 8 Developer Preview within the first 12 hours of its release.^[26]

[edit]New features

Bootable Windows To Go USB flash drive

Main article: Features new to Windows 8

Windows 8 will contain a new user interface based on Microsoft's design language named Metro. With the new change, the Start Menu was replaced in favor for the new Start Screen, where there are tiles that contain shortcuts to applications, Metro style applications, and updating tiles, similar to Windows Phone.

A new authentication method allows users to sketch in three different places over the picture to login, instead of typing a password.^[27][28]

Windows Explorer now uses a ribbon interface, similar to those used in Microsoft Office applications.^[29]

Another feature expected to be introduced in Windows 8 is native USB 3.0 support, without the need to load drivers^[30]

Windows 8 will come with Windows Store, an online marketplace for buying, selling, and advertising applications.^[31]

Windows 8 can be run from a USB-connected drive, such as a flash drive. This feature is called Windows To Go. It is intended for enterprise administrators to provide users with a Windows 8 image that reflects the corporate desktop; pricing and licensing details were not discussed when the feature was announced^[32][33]. WTG is not included in Windows 8 previews.

Windows 8 will support multiple monitors with the new ability to natively display different background images on each display and customized taskbar(s) on each of the connected displays.

The Developer Preview comes with two new recovery functions.^[34] Refresh and Reset, which both make a complete restore easier than a re-installation. The former keeps all the settings and files of the user intact and only reverses all changes to Windows files to its original state while removing all installed programs and apps. The latter deletes all files and effectively re-installs Windows, but without any additional user input such as agreeing to license agreements or selecting a hard disk required. After a reset completes, the user will be asked for the product key and will then proceed to account creation.^[35]

One big change is that user accounts do not have to be local-only (or from an Active Directory domain) anymore but can be linked up to one's Windows Live ID. This has the advantage that users will not lose their settings and files as they move from their home computer to their work laptop or to any other computer also using Windows 8.^[36]

Other new features include a new Welcome screen,^[37] a new packaged application model called AppX that is based on Silverlight,^[38] andOpen Packaging Conventions,^[39] as well as a setting to automatically adjust window color to fit the wallpaper.^[40]

There is also a stripped down "Immersive" version of Internet Explorer, using the similar Metro-based user interface of the mobile version ofInternet Explorer 9.^[41] The Immersive Version of Internet Explorer 10 does not support ActiveX plugins, in order to be an HTML5-only browser. The Desktop version of IE10 does support ActiveX plugins.^[42]

A new "Hybrid Boot" option that uses "advanced hibernation functionality" on shutdown to allow faster startup times.^[43][44]

A new version of Task Manager with a redesigned user interface is also present in pre-release versions of Windows 8.

[edit]Hardware requirements

The system requirements for the Windows Developer Preview (a pre-release version of Windows 8) are similar to those of Windows 7.^[45]

Minimum hardware requirements for Windows Developer Preview

Architecture	IA-32	x86-64	ARM
Processor	1 GHz		TBA
Memory (RAM)	1 GB	2 GB	TBA
Graphics Card	DirectX 9 graphics processor with WDDM 1.0		TBA
HDD free space	16 GB	20 GB	TBA

A multi-touch screen is required to use touch input. For Metro applications, a screen resolution of 1024x768 or higher is required.

Microsoft may also require new PCs to have the UEFI secure boot feature enabled by default to be given Windows 8 certification. There has been some concern about this, that it could lead to machines that do not support alternative operating systems.^[46] The manufacturer is free to choose which signatures are accepted by the feature and to offer the ability to turn off the secure boot feature.^[47] Microsoft has addressed the issue in a blog post.^[48][49]

Microsoft has revealed the following maximum supported hardware specifications for Windows Server 8 at the BUILD conference.^[50]

Logical processors	640 (as opposed to 256 in Windows Server 2008 R2)
Random-access memory	4 TB (as opposed to 2 TB in Windows Server 2008 R2)
Failover cluster nodes	63 (as opposed to 16 in Windows Server 2008 R2)

[edit]Compatibility

Windows 8 will run much software compatible with previous versions of Windows for x86 family of processors, with the usual restrictions: 64-bit Windows will run also 32-bit software but not 16-bit ones; 32-bit Windows will optionally run 16-bit software if installed to do so, but will not run 64-bit software. Either 32- or 64-bit Windows can be installed on x86-64 processors. Some expertise in manipulating compatibility settings may be required to run, for example, 16-bit software for Windows 3.x under 32-bit Windows 8, in cases where it is possible. In particular, applications compatible with 32- and 64-bit Windows 7 will run in the same way on Windows 8.^[51]

Although Windows 8 for ARM architecture is available, it will not run software created for x86; software will have to be ported by its developers.^[52][53]

Windows 8 Developer Preview is incompatible with some virtualization platforms, such as Virtual PC. A blog post by Microsoft notes that the setup process is error-prone when installing in a virtual machine, and installing without hardware virtualization support can be particularly problematic.^[54] It is reported to work under VMware Workstation and VMware Player—detailed instructions for installing in these environments have been published.^[55]
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source from : http://en.wikipedia.org/wiki/Windows_8