Hi AHMADQUDAIESAT, Thanks for your information. Based on your description, the error message states that the version of the your Outlook for mac is not work with the Mac OS. As we know that Mac OS 10.13 High Sierra is publically available for all Mac users to install.
Office 2016 for Mac is fully supported on High Sierra. But we recommend you update Office to version 15.38 or later for the better user experience. The detailed for you. For this issue, please try to update your Outlook for Mac to the latest version to see whether this issue persist. And you can update it: 1. Open other Office application (Word, Excel.).
On the top menu, go to Help Check for Updates. Under ' How would you like updates to be installed?' , select Automatically Download and Install. The detailed information about updating Outlook for Mac you can check this. If this issue persist after you update the Outlook, may I know whether you can access into the Outlook for Mac?
And you can send us a CtrlPrint to us for further help. Regards, Richard.
This error message after updating my MacBook to the newest software version. When I go to the app store, there is no update shown for Microsoft Outlook. Make sure your Mac has a working internet connection before. Microsoft Outlook with an Office 365 subscription is the latest version of Outlook. Previous versions include Outlook 2013, Outlook 2010, and Outlook 2007. Follow Office.