although R2 isnt officially supported it does work.
HOWEVER. the client needs tweaking on the server to get it run and I have had issues using converter, whether the converter issue was to do with 2008 r2 or not is being investigated.
And to backup previous comments a basic 2008 R2 install is 20gb BEFORE you put on any other software.
I am rebuilding my VC on 2003 to compair performance and converting
A VMware Consultant in Scotland for Taupo Consulting
www.taupoconsulting.co.uk
If you think I'm right or helpful award me some points please