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Check out this article. Run the Microsoft Upgrade Assistant, and it will tell you what is possible to upgrade to: <a href="http://windows.microsoft.com/en-us/windows-8/upgrade-from-windows-7-tutorial" rel="ugc">http://windows.microsoft.com/en-us/windows-8/upgrade-from-windows-7-tutorial</a>
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Check out this article. Run the Microsoft Upgrade Assistant, and it will tell you what is possible to upgrade to: http://windows.microsoft.com/en-us/windows-8/upgrade-from-windows-7-tutorial [http://windows.microsoft.com/en-us/windows-8/upgrade-from-windows-7-tutorial]

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According to Thorrott, yes:<br />
<br />
<a href="http://winsupersite.com/article/windows8/windows-8-tip-upgrade-previous-windows-version-143574" rel="ugc">http://winsupersite.com/article/windows8/windows-8-tip-upgrade-previous-windows-version-143574</a><br />
<br />
That is to 8 and not 8.1 &nbsp;I believe you have to do 8 first, then do the update from 8 to 8.1, that is you cannot go from 7 to 8.1 directly and keep the apps.
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According to Thorrott, yes:

http://winsupersite.com/article/windows8/windows-8-tip-upgrade-previous-windows-version-143574 [http://winsupersite.com/article/windows8/windows-8-tip-upgrade-previous-windows-version-143574]

That is to 8 and not 8.1  I believe you have to do 8 first, then do the update from 8 to 8.1, that is you cannot go from 7 to 8.1 directly and keep the apps.

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You can always upgrade to Pro from Home. Ever since XP, you could do this. <br />
<br />
However, BACK UP first. It does not always work correctly.
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You can always upgrade to Pro from Home. Ever since XP, you could do this.

However, BACK UP first. It does not always work correctly.

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You're welcome. All that helped deserve credit.
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You're welcome. All that helped deserve credit.

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Can Windows 7 Home premium be Upgraded to Windows 8 Pro without a clean install?
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Can Windows 7 Home premium be Upgraded to Windows 8 Pro without a clean install?

Windows 8 Pro Upgrade

Windows 8 is a personal computer operating system developed by Microsoft as part of the Windows NT family of operating systems, with an emphasis on improving its user experience on tablets. In particular, these changes included a touch-optimized Windows shell based on Microsoft's "Metro" design language, the Start screen, a new platform for developing apps with an emphasis on touchscreen input, integration with online services, support for USB 3.0, Advanced Format hard drives, near field communications, and cloud computing. Additional security features were introduced, such as built-in antivirus software, integration with Microsoft SmartScreen phishing filtering service and support for UEFI Secure Boot on supported devices with UEFI firmware.

Windows 8

Windows 7 is an operating system from Microsoft. Features include multi-touch support, a redesigned Windows Shell with a new taskbar, referred to as the Superbar, a home networking system called HomeGroup, and performance improvements.