As of two days ago, I used to be able to create an Active Directory user account, with an exchange account selected, and it would create the users mailbox. Now that mailbox doesn't get created. I have tried the following after the account was created:
1. Logon as the user, successful.
2. Send an email to the user, unsuccessful - delivery error
3. Restart exchange services - no errors logged in Event Viewer
4. Restart server - no errors logged in Event Viewer
This is Exchange Standard 2003 SP2 running on Server 2003 SP2.
If so then you should check your recipient policy. Thats what controls email addresses attaching to mailboxes when created.