Hi,
I use Outlook 2016 to connect to an on-premise MS Exchange 2013 server.
When opened, Outlook automatically connects to the server and synchronizes e-mails successfully. After about a minute, Outlook prompts for credentials. If I enter wrong credentials, the dialog re-appears immediately. If I enter correct credentials, the dialog re-appears after about five seconds. During this process, the status bar shows "Connected to Microsoft Exchange". I can only get back to work by choosing "Cancel" in the credentials dialog, which makes the status bar turn to "Enter credentials" (wording may differ slightly, this is translated from the German version). When I do that, I can still send and receive e-mails. Other functionality (e.g. accessing shared calendars) does not work properly (in that very case, Outlook tells me that I don't have access rights for the shared calendar).
If I click on "Enter credentials" in the status bar, the status bar immediately turns to "Connected to Microsoft Exchange". But again, after about a minute, Outlook starts prompting for credentials as before.
What can cause this issue? How can I resolve it?
Nico
