Can't install Office 2010 Beta on Server 2008 R2

Can't install Office 2010 Beta on Server 2008 R2

I've just tried to run the the install for Office 2010 Beta Home and Business on Server 2008 R2, and I get an error dialogue saying Office requires Windows 7, Vista SP1, or XP SP3. I've tried running the install in compatability mode for all three with no luck.