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“.
Before High Sierra launched, Microsoft announced that it would not be offering “formal support” for its Office 2011 apps in macOS 10.13 High Sierra. Support for Office 2011 for Mac was due to. Microsoft has warned users of Office for Mac 2011 not to upgrade to Apple's macOS High Sierra when the new operating system launches next month. 'Word, Excel, PowerPoint, Outlook and Lync have not. Microsoft has shared vital information on supportability of running Office applications on newly announced 10.13 macOS High Sierra by Apple. While the new operating system is not generally available to all users right away, developers and beta testers may have access to beta seeds and Apple is planning to release 10.13 as a free upgrade to all.
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.