After we migrated our Exchange from a Windows Server 2003 R2 server running Outlook 2007 SP3 to a new server running Windows Server 2012 and Exchange 2013, some phones cannot reconnect to the server.
We have tried removing the Exchange account from the phone and adding it back. This worked for some phones but not others. One user even wiped his phone and tried to add the account but it did not work.
There is no problem with any desktop user or OWA user.
One clue may that on a couple of the phones it pointed to a certificate authority that was on the old cert in its error message. We had had to change the UCC cert to point to the new server (and remove the old), and also repointed DNS as part of the migration but these phones are not taking the new path.
Anybody have an idea on troubleshooting steps we could take? Problem phones are mostly LG Lucid and older iPhones + a couple older Motorolas.
I did try mobile device management in the old Exchange console but since we moved the mailboxes already it won't let us manage them. The phones don't exist in the new server mailboxes. I suspect the old association is in place but I don't know how to remove it, or if that is even the problem.
If anyone has any ideas please let me know, thanks!