Hey Cullen - Prior to Server 2008 (if memory serves), Datacenter edition was essentially a different enough o/s from Standard, Enterprise, and other editions and that is why it was not supported. However, since then Microsoft changed the o/s to be identical to Enterprise with the exception of licensing. That is where we are today. There are clients that run Sage 100 on it successfully today and it should run just fine for you as well. I don't see any reason you should change that, especially for your test system. This also means the SPM is just un-updated (still un-updated) on this point. 

Hey Cullen - Prior to Server 2008 (if memory serves), Datacenter edition was essentially a different enough o/s from Standard, Enterprise, and other editions and that is why it was not supported. However, since then Microsoft changed the o/s to be identical to Enterprise with the exception of licensing. That is where we are today. There are clients that run Sage 100 on it successfully today and it should run just fine for you as well. I don't see any reason you should change that, especially for your test system. This also means the SPM is just un-updated (still un-updated) on this point.