In a test environment, I migrated a SBS 2008 (Exchange 2007 SP3 RU 11) server to Exchange 2013 SP1. In the test environment, the Legacy co-existence between Exchange 2007 and 2013 was not setup. After fully decommissioning the SBS 2008 server, I noticed that none of the mobile devices moved over to Exchange 2013.
Since then, I have added Exchange 2013 to the live environment. The Legacy coexistence has not been setup. All mail through the firewall is still flowing through the SBS 2008 server. Autodiscover, ActiveSync, Outlook Anywhere, OWA are all working fine through the SBS server. IPV6 is not disabled on the SBS server.
I attempted setting up the legacy namespace on the SBS server. When the mail flow was switched over to Exchange 2013 on the firewall, ActiveSync stopped working on all mailboxes on the SBS server. We had a small maintenance window, so we had to revert back to the SBS server. Next time, I will try a Null URL for the External ActiveSync on the SBS server.
Since then, I have setup a test user on the SBS server. I have added a mobile phone to the account. The mail worked fine on the phone. I migrated the test user to Exchange 2013. The mail on the phone stopped working. The mobile device partnership for the test user is blank in ECP.
Do you think there is a problem with the SBS server? If so, how do I fix it? I can't attempt to migrate the mailboxes until I resolve this; setting up all the mobile devices again is not an option.
I also cannot setup a mobile device on the Exchange 2013. Will this resolve itself when the Legacy namespace is setup and the mail flows through the Exchange 2013? When I run the Microsoft Remote Connectivity Analyzer against a mailbox on the Exchange 2013, it fails with a HTTP 451 error.