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Will upgrading a PDC from NT 4 to W2003 "break" an Exchange 5.5/W2K Server?

Posted on 2008-10-08
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Last Modified: 2010-03-06
I have a Windows NT 4.0 PDC.

I also have an Exchange 5.5 Server running on Windows 2000 Server.

If I upgrade the PDC from 4.0 to Windows 2003 server (which will use AD), will the Exchange server still run?

(I will eventually upgrade the Exchange server to Windows 2003 Server / Exchange 2003, but I'd rather do that at a later time.  However, I'm worried that after the PDC is upgraded to Windows 2003 Server, the Exchange Server won't work until it's upgraded.)
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Question by:brianp111
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rakeshmiglani earned 500 total points
ID: 22676248
exchange 5.5 would work fine as 5.5 does not use AD but has its own directory.
just make sure that the exchange server account is migrated properly.
also take a backup of all exchange databases before doing anything.
incase something goes wrong with the service account migration, you can check http://www.microsoft.com/technet/archive/exchangeserver55/support/changing.mspx?mfr=true
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