Hello,
I'm in the process of migrating mailboxes from Exchange 2010 SP3 servers to new Exchange 2013 SP1 CU6 servers.
I'm seeing issues post migration with around 50% of users, being prompted for credentials when opening Outlook. All users use Out look in cached mode.
The connection that is prompting is that for the OAB download. Once the creds are entered the connection is established and the OAB can be downloaded.
The users that are being prompted for credentials are downloading the OAB associated with the new Exchange 2013 database to which they have been migrated.
The users who are not being prompted for credentials are downloading the old 2010 OAB, even though their mailbox resides on a new Exchange 2013 database with a new 2013 OAB associated.
It's worth mentioning that public folder distribution is enabled for the 2010 OAB, as well as web distribution.
Public folder distribution is not enabled for the 2013 OAB, as I understand it cannot be enabled (and errors when I attempt to enable).
The public folder hierarchy has yet to be migrated from 2010.
Can anyone explain why I'm seeing this issue, and how to overcome it?
Thanks
Matt