To narrow down the problem, if possible, would you please try with Outlook 2013 and see if the problem persists?.Are the affected devices domain-joined?.Do all the affected users use the same Outlook version? (Outlook 2016.If you don't see the popup, does the additional mailbox show a status of disconnected and the folders are not updated? network problems are preventing connection to Microsoft Exchange.) Is the detailed error the same as in the following screenshot when you try to open the additional mailbox in Outlook?.However, sorry I still need to ask the following questions: Hopefully we get a tip, even how small, and we can find the solution for this strange behaviour. Is that correct? Can't remember I have changed that in the past. At back end mapi has anonymous auth and forms auth on. At IIS level default web site / mapi / only windows auth is on. Now the authentication is as follows: windows authentication-ntlm and windows auth-negotiate are on. related ot the virtual directories? Maybe our mapi settings are not as wished? What I want to ask is: could it be an issue on the Exchange server. We also removed some Windows profiles and created them from scratch. But as said earlier not everybody with extra mailboxes does have issues. Yes some more than 10 in one Outlook profile. Could this be an issue? We have a lot of people who have extra mailboxes. Some people reacts more often then others, that is true. And when I go back to the original outlook profile it goes open without a notification.Įxtra: there are only a few people who has seen this popup but I cannot say if it is always the same group of people. When creating a new profile sometimes it opens without a problem, sometimes it doesn't. Sometimes there is no popup at all and Outlook does not open. Of course I can change that to accountAA, fill out the password an Outlook opens. In that popup I see the credentials of that added secondary mailbox. So to be clear: I logon to windows with accountAA, I open Outlook and the primary mailbox is of course the mailbox of accountAA, but credentiasl are asked via a popup. What we likely are seeing is that while opening Outlook the credentials are asked from the mailbox which is connected to the account of the user. although at that moment there are no issues with the connection of the Exchange server because the other 500 people can still work. but the the important thing is that if we do nothing it solves itself after minutes, hours. We tried changing add-ins, safe mode, new profiles. Sometimes when he opens his Outlook he gets the popup that Outlook cannot be opened and that the set of folders cannot be opened. And also in his profile he has another mailbox we use the credentials of that mailbox. There is already a lot of information about this kind of issue but none does the trick for us. Situation: Exchange 2016 cu18 with all the available patches.
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