In-place upgrade of Windows 7 Ultimate to Windows 7 Enterprise

Question

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!

Answer 1

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