Hello. I am in the middle of piloting an Exchange 2010 to Exchange 2010 cross-forest migration. There is a two-way trust setup. Federation Trusts and Organization trusts are setup and tested. The Autodiscover is also functioning on both sides. However, after migrating a user to the destination, the test ActiveSync users phone no longer is able to connect. As soon as the account is deleted from the phone and recreated, all works without an issue. On the source side, there are two events for ActiveSync ID 1008 that are logged and they indicate an issue with the device partnership. However this is for the source side.
Any help would be appreciated.
Thanks.