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I mistakenly installed Server 2008 R2 as Standard, but my license key is only valid for Web. Can I downgrade my current installation to Web without re-installing?

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up vote 7 down vote accepted

Nope, a reinstall is required

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The process to downgrade to Windows Web Server 2008 R2 to Windows Server Standard 2008 R2:

Open Windows Registry Editor:

Browse to HKLocalMachines > Software > Microsoft > Windows NT > Current Version > Edition ID

Then change the value from []Standard to []Web.

Then run the install DVD and run the downgrade. This worked for us.

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No. I believe you are warned about this when you choose the edition of the operating system to install.

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Yea, but who ever reads those annoying little warning messages? ;-) – ProfK Jan 31 '10 at 4:57

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