I have a multi forest, multisite, mixed exchange environment. I built a new multirole (HT/CAS/MB) 2010 server and everything seems to be working just fine. I've migrated users over to it and no issues that i'm aware of. Nothing of concern coming up on the ExBPA when I run it. I'm running into an issue when creating a new mailbox and associating it with a user account that does not have a mailbox (just created). I specify the database and attempt to create and get the following error: The operation couldn't be performed because object 'east.contoso.com/Sales/Users/Boston/testuser' couldn't be found on 'CorpDC2.contoso.com'.
Wierd thing is as I'm writing this, I tried to create the mailbox again and it succeeded? Curious as to why the inconsistency. Nothing abnormal in App Logs. I do know that the exchange server is part of the east.contoso.com domain. If I log in to CorpDC2 which is on the parent domain, the directory structure is different. Could this be why it's complaining about not finding the user object?
Thoughts?