Windows Vista Upgrade Advisor is designed to help Windows XP users identify whether their PCs are ready for an upgrade to Windows Vista, which edition of Windows Vista meets their needs, and which features of Windows Vista will be able to run on their PCs.
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vistasp1.net has posted links to six hotfixes set to appear in Windows Vista SP1 (Service Pack 1) codenamed Fiji. All six fixes can be obtained via Microsoft Support if you can prove that you are indeed having the problem listed. The site links directly to Microsoft KB articles that describe each problem in Vista.

929734 - You may experience problems after you resume a Windows Vista-based computer from sleep or from hibernation
929191 - IBM and Lenovo computers may t ... more

This is a set can be XP/Server Windows 2003 operating system. perfect simulation software into Windows Vista interface. In 2007 X 'Mas issued a formal version 6.0
Changes in Version 6.0 :
-Added additional Vista related applications:-Added Additional Vista related applications :
|-thoosje's brand new Vista Sidebar|-thoosje 'S brand new Vista Sidebar
|-VisualTooltip (Taskbar thumbnail view and also have docking mode)|-VisualTooltip (Taskbar thumbnail view mode and also have hIL-6R)
|-Styler with Kaye Irene's Vista Perfection X4 Styler Toolbar|-Styler With Irene Kaye 's Vista Perfection X4 Styler Google | ... more

TweakVI - The first software designed to both tweak and optimize Windows Vista.
Tweak hundreds of hidden features of Windows Vista, optimize your machine and customize it to your needs. The best tweaking software ever!
The main application of TweakVI together with many plugins is available completely for free. Additional plugins can be downloaded after subscribing
Unlike other tweaking utilities, TweakVI bundles lots of different utilities in one. It was developed to combine both tuning and optimizing features to increase the speed of your Windows Vista system. It's the worlds first software for Windows Vista to combine both customization, tweaking and optimization features. ... more

This release will cover on new system files replacement system which should be 100% working fine as far as testers reported. It also have huge improvements regarding setup integration and uninstallation. I made various bug fixes for setup integration which should work much better than version 5.5 and added more options about uninstallation for system files. You can choose to restore system files from setup CD now! You might not know uninstallation will automatically reserve file that has different file version in case you uninstall after applying Windows Update. Now you can choose not to reserve it if you want.
Changes in Version 6.0 RC1
-Added browsable Syste ... more

A source close to Microsoft has confirmed to me that Windows Vista will in fact carry the build number 6.0.6000. He found this out by receiving a mail with the build stamp "Microsoft Windows Mail 6.0.6000.16384" so that ends that speculation.Also the MSDN subscription page has been updated with the following information

Windows Vista and Office 2007: Availability on MSDN Subscriber Downloads
Windows Vista and Office 2007 will be available through MSDN Subscriber downloads within 7 days of release to manufacture (RTM). MSDN Subscriptions is committed to making new content available to our subscribers as soon as is practical.

Several key Mi ... more

vista_5840.16384.061018-1900_x86fre_client-LRMCFRE_EN_DVD.iso
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The Microsoft Windows Mobile Device Center Beta 3 enables you to set up new partnerships, synchronize content and manage music, pictures and video with any Windows Mobile 2003 or Windows Mobile 5.0 powered device. Windows Mobile Device Center Beta 3 is only supported on builds of Windows Vista™ RC1 or later.

Download : Microsoft ® Windows Mobile Device Center ® Vista ™ Beta 3 for Windows (x86)
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This build (5744) has a number of improvements and updates from previous builds, and has been through daily testing processes to refine quality and performance. We are making this release available for a limited time only (and only by download) in order to get broad distribution and testing in a variety of PC configurations.                    
Please note: This build may not have the same level of support or servicing via Windows Update as RC1, and you may not be able to upgrade from this build to the final version of Windows Vista. To c ... more

Microsoft is currently getting ready for the Windows Vista RC2 release. This build, 5744 has numerous improvements and advancements in performance. 

To see the preview of the download page:
http://download.windowsvista.com/preview/rc2/en/download.htm

Microsoft is currently getting ready for the Windows Vista RC2 release. This build, 5744 has numerous improvements and advancements in performance.  To see the preview of the download page:  http://download.windowsvista.com/preview/rc2/en/download.htm ... more