We recently did a migration of Small Business Server (SBS) 2003 to 2008 and Exchange 2003 to 2007 and encountered a rare error. There were no posts anywhere on this problem so I've decided that I shall enlighten anyone else who encounters this.
We ended up spending over a week trying to fix this and ended up having to get Microsoft envolved, at a cost of £200. The problem was that Outlook clients were unable to connect to their mailboxes and recieved the following error "Unable to open your default e-mail folders. You must connect to your Microsoft Exchange Server computer with the current profile before you can synchronize your folders with your offline folder file". What really through us off and even Microsoft is that users could access thier mail via Outlook Web Access (OWA).
It turns out that this was due to a setup failure for the Mailbox Server Role. This failure was due to invalid smtp address format for several mail-enabled public folder objects. Example:
OfflineAddressBook-/o=FirstOrganization/cn=addrlists/cn=name@domain.local
where "OfflineAddressBook-/o=FirstOrganization/cn=addrlists/cn=name" is an invalid alias format.
To fix this we did a full backup of the mailboxes and then mail-disabled each one of the public folders that had this problem. We then reran the installation of the mailbox server role.
I hope this helps someone out there.
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