Outlook for Mac Keeps Dropping Offline

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hbmiller

New Member
Outlook version
Outlook 2016 for Mac
Email Account
Exchange Server
Running Outlook for Mac 2016 (current version 16.13, but same problem in prior versions) on three Mac laptops with a Rackspace Exchange Server account. All three experience the same issue. After running well, often for several hours, the account goes offline and produces a popup error message:

"The server for account [ ] returned the error "Logon failure: unknown user name or bad password." Your username/password or security settings may be incorrect. Would you like to try re-entering your password?"​

If I click on "no," and then "send/receive," the system reverts to normal, usually for another few hours, without having a password re-entered.

I have tried all of the obvious fixes, including deleting all Microsoft identity chains. Has anyone seen this or experienced it? Is there a fix?
 

hbmiller

New Member
Outlook version
Outlook 2016 for Mac
Email Account
Exchange Server
It is solely accessed using Exchange -- including on three iOs devices (which do not experience this problem) and on one Windows 7 device (which does not experience this problem). It seems to be limited to the Mac Outlook clients.
 
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