How to Conquer From “An unknown error has occurred in Mac Outlook 17199” Error

DataHelp Admin | Modified: 2021-05-30T15:20:00+05:30 | Mac outlook

Microsoft Mac Outlook error 17199 is a very simple and noncomplex error that can be easily resolved by the user itself, so there isn’t any reason to get worried whenever it occurs.

Error message 17199 occurs when we try to send an email message in Microsoft Outlook for Mac 2011. Now let us take a look at what is Microsoft Outlook for Mac.

Microsoft Outlook for Mac

It is an Outlook facility for Mac Outlook users which was earlier available only for Windows users. The latest version is Microsoft Outlook for Mac 2016.

The database files used by Microsoft Outlook for Mac uses OLM file format for storing email messages, contacts, journals, and other application data. OLM is the file format that is used by Mac Outlook to store all its data and cannot be opened by the Windows version of Outlook as the OLM version only uses PST file format.

What Does Outlook Unknown Error Look Like?

Error code: – 17199 “An unknown error has occurred in Outlook. A message in your Outlook could not be sent. The account which created the message could not be found.”

Even when the user tries multiple times to send the message, he fails. They may also be asked to re-enter their password. Error 17199 mac cannot be removed by reinstalling the MS Office Application, so don’t go ahead with it. As we know that Outlook for Mac uses OLM files, these OLM files become inaccessible. There can be various reasons leading to this inaccessibility. Some are as follows:

  • Trying to import Mac OLM files into Outlook for Windows, without altering the file format.
  • An abrupt crash in Outlook.
  • Improper shutdown of the application.
  • Issues related to increasing the storage size.

Extra Info: 

If you want to access Mac Outlook data file on your Windows computer system. Then you can use expert suggested DataHelp OLM to PST Converter.

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How Can Microsoft Mac Outlook Error 17199 be Resolved?

This error can be resolved by following a sequence of simple steps which are explained below:

  1. To make sure there is an uninterrupted internet connection. This is facilitated by logging into any email account
    like Gmail, which makes sure that your internet connection is stable.
  2. Discard all the emails or we can say drafts present in the Outbox folder. After which click the ‘Send/Recieve’ button,
    if the issue still exists then go to step 3.
  3. Re-enter username and password.
    • Open Outlook
    • Select tools and then click on accounts.
    • Select your email account on the left side of the window.
    • Enter your credentials correctly.
    • Check if the incoming and outgoing servers are correctly chosen.
    • Close the window.
  4. Rename your existing identity, this can easily be done with the help of Microsoft Database Utility, which comes along with the package of Office. This application will help you in rebuilding an identity.
    The default location of the Microsoft Database Utility is: /Applications/Microsoft Office 2011/Office/.


Thus, whenever you encounter “An unknown error has occurred in Outlook 17199”, directly follow the above-mentioned steps, which work miraculously to recover your OLM files from the error. Thereby, enabling you to easily send email messages to different destinations.