Hi
We are in a migration of Exchange 2007 to Exchange 2013, so for the moment it is a coexistence.
I migrated 2 mailboxes to Exchange 2013. After the migration, outlook started prompting for a password by starting outlook. Once the password has been entered, outlook works fine. But that happens only if outlook cache mode is active. If I disable cached mode, outlook starts without prompting for a password.
So I deactivated cached mode, deleted the ost file and again activated cached mode. Now Outlook starts without prompting for a password, even if cached mode is active.
Deleting the ost file for 1 or 2 users is fine, but not if there are 200 more mailboxes to migrate.
I cannot reproduce the behavior with test mailboxes, created after Exchange 2013 has been installed into the organization. All these mailboxes can be migrated without password prompts.
By the way, I found different posts about the authentication settings for outlook anywhere. I found on Exchange 2007 that the ClientAuthenticationmode was Basic, while NTLM on Exchange 2013. So I changed it to NTLM as well. Everything is still working.
I am going to migrate 2 more mailboxes, and I will see tomorrow if the problem still exists.
Any Suggestion?
Regards
Peter