I have been trying to promote Windows 2012 server as a domain controller in 2003 environment - but not joy. So I was advised to install 2008 server and then move to 2012 DC.
I have installed 2008 server and promoted it to a DC. I still cannot promote the 2012 server and it sees the 2003 server running Exchange as FMSO. Even though I have made the 2008 the FMSO.
So I am now thinking of demoting the 2003 server by removing the Active Directory - then I can raise the domain functional level to 2008. I guess then it will be easier to promote the 2012 to a DCs.
But will the exchange 2003 server continue to function normally after demoting the DC on the 2003 server? I read it can. But its been a while and I just want to confirm it.