In my case it was one of the rarely described problems, but if you know it, it is quite simple to solve. Windows (in this case it was Windows 7 as well as Windows 10, with Outlook 2010 as well as 2016 on an Exchange 2010, but probably it would be the same on 2013 or 2016) stored some of the old login credentials in the system and became confused.
You simply go to the Control panel, open the credential manager (maybe you have to change to "Windows login informations" like in Windows 10), and find some entries further down, one or more containing the word "Outlook". When you expand them you find a link to click and delete the entry. And voila, the problem - in my case - was solved !
Good luck !
And here is the original Microsoft posting on this:
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