I currently have Exchange 5.5 running in the Windows 2000 Active Directory. I'm thinking of adding another Exchange Server and want to go with Exchange 2003. Does anyone know if they can run in Mixed Mode. Also, can Active Directory stay on 2000?
I believe Exchange 2003 will run in a Windows 2000 AD enviroment if your 2000 AD is SP3 or greater.
As far as coexistance it should work but during my migration I had problems with users on my 5.5 server sending mail to users on my 2K3 server and did not take the time to figure it out. I just moved everyone over.
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