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Is there any way to do an in-place upgrade from Windows 7 Ultimate to Windows 7 Enterprise? I get an error saying that there's a compatibility issue, but perhaps there's some way to modify the registry to bypass this restriction?

Thanks!

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No, this scenario is not supported by Microsoft.

Here is Microsoft's official list of supported upgrades:

http://technet.microsoft.com/en-us/library/dd772579(WS.10).aspx

note: this would technically be a downgrade rather than an upgrade

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I realize that. That's why I wanted to know if there was a way to bypass the restriction by modifying the registry. – srunni May 15 '10 at 23:16

You can use a registry edit to do it:

HKLM\Software\Microsoft\Windows NT\CurrentVersion\

HKLM\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion

Change where it says Ultimate to Enterprise

Once you have done that load the Windows 7 Enterprise CD and do the upgrade install - Without UPDATES - and everything works just fine.

Once installed go to Disk Cleanup and do: Clean up system files - Previous Windows installations

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