I am receiving the following errors in the event log of the Exchange server:

Unexpected Exchange mailbox Server error: Server: [server.domain.local]
User: [username@smtpdomain.com] HTTP status code: [501]. Verify that the
Exchange mailbox Server is working correctly.
For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.

This occurs after a successful synchronization on the mobile device. The
device syncs okay but as soon as the status changes to "Connected" it
immediately tries to sync again and then sets the status to "Last
synchronised at". I have gone through nearly every setting in our firewall
and cannot see anything that could be causing this. I have also checked out
the logs to ensure nothing is being blocked during the sync process.

Does anyone have any idea what is causing the 501 HTTP error? The device is
getting to the server because the emails get transferred however the AUTD
function does not work and the devive seems to poll for new messages rather
than staying connected to the exchange box as it had been.

Any assistance would be greatly appreciated.

Thanks,
Charles Evans

Archived from group: microsoft>public>exchange>mobility