Migrating to Exchange

Reestablish Coexistence for Migrated Mailboxes

If you want to reestablish coexistence between Exchange 2000 and Exchange 5.5, create a custom recipient on Exchange 5.5 for each mailbox you migrated and deleted. Custom recipients appear in the address book and can receive messages from users still on Exchange 5.5.

You can create custom recipients either manually or automatically: