Hello,
We are in the process of attempting to migrate to Exchange 2013, but during the migration time, we need to coexist with the two versions. Our outlook clients are a mix of Office 2007, 2010, and 2013. When a user is migrated from 2010 to 2013, they start getting prompted for their password in Outlook every few minutes. They can click cancel and continue working, but they continue to get prompts for their password. If they click the update folder button in outlook, it updates fine, and the password prompt goes away for awhile.
Most topics on this state that this is caused by a certificate issue. We have an internally deployed CA, with the Root certificate trusted by all clients. The exchange 2013 server has a certificate that was created by this CA.
I believe that this is caused by OAB (address book) still being hosted on the Exchange 2010 server (with a self signed cert), that is causing the connection to fail. Is there anyway to test this without breaking outlook connections for the users that are on Exchange 2010? Or is there any other reason that this would occur?
Thanks for any assistance.