outlook 2016 on Mac - "Mailbox already exists" error.

Anonymous
2016-10-06T05:13:04+00:00

Error "mailbox already exists (0.000 + 0.000 secs)" - and outlook loses connection to IMAP server (shows empty account).

Then, either through manual intervention (clicking on another account and then coming back), or sometimes it just does it by itself, it "rediscovers" my IMAP mailbox and works OK... Until next time (falls over every ?? 30 minutes or so).

Using outlook 2016 on Mac, V15.26.1. This also happened on previous version.

Didnt used to be a problem. Just started about 2 weeks ago with no changes from my end that I am aware of!?! Upgraded to latest Version today. Made no difference.

Advice welcome!

Outlook | MacOS | Legacy Outlook for Mac | For business

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  1. Anonymous
    2017-03-09T03:58:37+00:00

    I've tried everything recommended short of reformatting my mac which I am not going to to. I've had it with outlook - on to Mac Mail.

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  2. Anonymous
    2017-04-02T13:15:26+00:00

    I have used Outlook for decades, but this is intolerably. I concur, only solution is use Mac Mail, Microsoft doesn't have the time for this issue.

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  3. Anonymous
    2017-05-31T10:18:13+00:00

    I also have encountered the same issue with the frequent "Error "mailbox already exists (0.000 + 0.000 secs)" - and Outlook losing connection to the IMAP server (shows empty account).

    Then, either through manual intervention (clicking on another account and then coming back), or sometimes it just does it by itself, it "rediscovers" my IMAP mailbox and works OK... Until next time (falls over every ?? 30 minutes or so).

    Using outlook 2016 on Mac V15.34, MAC OS (10.12.5).

    I had to bite the bullet and purchase an OLM to MBOX converter and am now happily using Mac Mail.

    Very disappointed in Microsoft on their local of resolution to this.

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  4. Anonymous
    2017-06-01T19:10:33+00:00

    Same with me!  About 2 months both with my Macbook Air and my iMac.

    Reloads the IMAP inbox all day long and gives me the errors.

    I double-checked my settings and everything is ligit!

    I'm on 365 with 10.12.2 Sierra.

    Tried a new Outlook profile, tried regenerating the account, at my wit's end...

    I've had this problem for several months now. Microsoft techies spent 3 hrs, uninstalled, reinstalled Office 2016, etc and still no success. All day losing IMAP emails and redownloading them. But only with my Comcast 3 accounts. Gmail works perfectly. The comcast accounts work on the iphone and ipad, and windows 10 pc so doesn't seem to be provider issue. Seems to be Outlook for Mac (Office 365) problem. Very irritating. Researched all kinds of things online before contacting Microsoft and nothing worked for me. I'm using latest Sierra 10.12.4.

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  5. Anonymous
    2017-06-01T22:19:45+00:00

    I've tried everything recommended short of reformatting my mac which I am not going to to. I've had it with outlook - on to Mac Mail. 

    I do not have the problem with gmail using outlook for mac. One option would be to change to a gmail account. It's despicable that Microsoft is forcing this, but it's one option besides mac mail which I don't like.

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