Is it ok to have FSMO roles running on a mixture of operating systems? For example, a PDC Emulator on Windows Server 2003 and a Schema Master on Windows Server 2008?
Yes, it’s generally ok. The main issue people typically run into is that the PDCE is used to create special groups by certain components and if the PDC is not at that component’s OS level, the groups will not be created.
For example, these groups will not get created until the PDCE role moves to a Win2008 or later DC:
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