I have 2 Exchange servers on 2 domains. I'm moving people over slowly from one Exchange server to the other.
Domain 1 is cpp.local
Domain 2 is cppistons.com
A trust relationship exists between the two domains. This isn't germaine, but I have contact accounts for each person to forward between the servers.
Everyone logs into cpp.local. That will continue.
Here's the problem: At night, people using the Domain 2 Exchange server and using Outlook 2000 have their global address books revert to the one on Domain 1. This seems independent of rebooting. If they use the Domain 1 (cpp.local) addresses to send mail, their mail will is rejected because they're using the Exchange server on domain 2 (cppistons.com).
The long term goal is to move all resources over to the new domain. We're starting with mail.