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