I just upgraded to exchange 2013 from 2007 and now, all my external clients are prompted with a user/pass login. When they enter the info, it still prompts them again and again.
Internally, on my LAN, I had the same issue, but I got that resolved with a registry change, but the registry change did not solve the issue for the external clients. I'm at a loss of what to do. I even deleted the profile and ost file for one of the clients and I even upgraded him to outlook 2013, and it's still prompting for a user/pass externally.
Any thoughts or ideas?
Dan