Cannot run schema upgrade from server 2008

Hello

I am migrating from 2007/2010 envirement to 2013. The exchange organisation is in a subdomain so I have to to the schema upgrade an prepareAD from the top domain.

The top domain has no mamber servers, just server 2008 sp2 domain controllers så I will do it from one of them.

Have installed .net 4.5 and mgm framework 3, but I get the error message.

Setup.exe /PrepareSchema /IAcceptExchangeServerLicenseTerms
An unsupported operating system was detected. Exchange Server 2013 Client Access, Mailbox, and Edge Transport server roles support Windows Server 2008 R2 SP1 or later and Windows Server 2012.

Is it not possible to run this from Server 2008 with sp2?

Regards