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I'm about to embark upon a migration from an NT4 domain to Windows 2000. I have Exchange 5.5 running on an existing BDC. After upgrading the PDC, can I then upgrade the BDC? Are there any known problems with upgrading a BDC with Exchange 5.5 on it? Is it a good idea to have your Exchange Server on a BDC? Should I transfer Exchange to a member server before upgrading the BDC?
Upgrade the PDC first. When it comes time to upgrade the other BDC with Exchange on it you will need to use the Active Directory Connector. This will allow your Exchange system to communicate with the new directory that Windows 2000 will create. Exchange 5.5 has it's own directory, which is unfortunately incompatible with the Windows 2000 AD. The connector allows for the communication to occur correctly. Check out this
. There are several good papers on Exchange upgrades. Of course, if you have any questions about this stuff, send us another e-mail!