If you’re running version 15.32 of Microsoft Outlook for MacOS or lower, and have upgraded to MacOS High Sierra, you will receive an error that says “You can’t use this version of the application “Microsoft Outlook” with this version of MacOS“.
You can fix this problem with these steps.
- Open Microsoft Word, Excel, or another Microsoft application.
- Select “Help” > “Check for updates“.
If you don’t see this option, or if you don’t have an option to update, download and install AutoUpdate.
- Walk through the wizard to update Microsoft Applications. You will be able to upgrade Microsoft Outlook.
Once updates are complete, Microsoft Outlook will work in MacOS High Sierra.