Hi All -
We have a customer in an ongoing migration from Exchange 2010 to Exchange 2013. With a mixture of Outlook 2010 and 2013 clients. There are 2 Exchange 2010 servers and 2 Exchange 2013 servers. End users from day to day with no clear logic receive pop boxes requesting they enter their user names and password....but as some many have stated in the past...putting in username and password does nothing as the pop comes right back.
At first the issue was just with the migrated users however now the Exchange 2010 users are receiving the same security popup.
I've read numerous articles and links about how to address this issue. Nothing seems to be working...OR I have not implemented the suggested changes correctly. I have basic command line knowledge so any suggestions please provide step by step instructions.