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Exchange ActiveSync stopped working for some devices

Last Modified: 2013-12-27
We are in the process of moving mailboxes to a new storage group on a new SAN. Things started off OK, but we have run into major problems with users who are syncing mobile devices to the server. These devices are mostly iPhones. I have tried:
-deleting the account on the phone and re-adding it
-removing Exchange attributes then reconnecting mailbox
-deleting device from mobile admin
-increase firewall timeout on HTTPS

Nothing is working so far. Please post any suggestions, if you have them.
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