I have an Exchange 2000 domain controller (server 2000) that I am planning to upgrade to 64-bit Exchange 2007 on a Server 2003.

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Tags:
Adprep
Domain Controller
Microsoft Exchange 2000
Microsoft Exchange 2007
Microsoft Exchange errors
Microsoft Exchange migration
Microsoft Windows Server 2003
I have an Exchange 2000 domain controller (server 2000) that I am planning to upgrade to 64-bit Exchange 2007 on a Server 2003. The adprep /forestprep command errors. I have checked and the mangled attributes are not the problem. I'm hearing that the entire domain must be upgraded to 2003 before I can proceed. However, I'm at a stopping point since I cannot seem to get past this error w/ Exchange. Please see error message below. Adprep was unable to extend the schema. [Status/Consequence] There is a schema conflict with Exchange 2000. The schema is not upgraded. [User Action] The schema conflict must be resolved before running adprep. Resolve the schema c onflict, allow the change to replicate between all replication partners, and the n run Adprep. For information on resolving the conflict, see Microsoft Knowledge Base article Q325379.

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Did you update and extend the schema on your DC’s first? Can you demote the exchange server and remove the DC role from it? It is against microsoft best practices to have exchange and dc roles on the same server anyhow. I would try removing the dc role first from that exchange server. Our organization migrated from exchange 2000 to exchange 2007 this year. We had exchange 2000, 2003 and the new 2007 exchange servers all in coexistence for just over a year until the mgration was complete so this is possible. We had to have all of our DC’s at the same level at each stage however. We updated them to server 2003 DC’s first before installing the 2003 exchange server, then updated them again before installing the exchange 2007 servers, but we did not remove any of the exchange servers until we were completely migrated over to 2007.

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