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Does anyone know how to downgrade Windows Server 2008 R2 Standard to non-R2. Apparently the 2 uses diffenret licence keys. Initially I installed the R2 version but later I realise that I am only entitled/have the non-R2 standard licence key. I cannot activate the R2 licence with the non-R2 key. Is there a way for me to downgrade the R2 to non-R2 so that my licence key is accepted, other than reinstalling it from scratch again?
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Does anyone know how to downgrade Windows Server 2008 R2 Standard to non-R2. Apparently the 2 uses diffenret licence keys. Initially I installed the R2 version but later I realise that I am only entitled/have the non-R2 standard licence key. I cannot activate the R2 licence with the non-R2 key. Is there a way for me to downgrade the R2 to non-R2 so that my licence key is accepted, other than reinstalling it from scratch again?

Downgrade Windows Server 2008 R2 Standard to non-R2

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.