Enter the following command and hit enter:ĭefaults write DisablePreviewForSMIME 1.

Open the Terminal (Applications / Utilities or you can use Spotlight to open the Terminal app).

Following these steps will disable the preview feature for encrypted email which is known to cause Outlook to freeze. Updating Outlook will also fix if you are seeing the “You can’t use this version of the application “Microsoft Outlook” with this version of macOS“ error message.ģ. If you downloaded Outlook from the Mac App Store, then open the App Store app to update it. And click Update if there are updates available.

Update Outlook on Mac: Open Microsoft Word, Excel, or another Microsoft Office application, and then click Help > Check for Updates.

If your Mac version is macOS High Sierra or earlier, then go to the App Store app to update the software on your Mac.

Update your Mac: Go to System Preferences and click Software Update.

Make sure that both macOS and Outlook are up to date. You can restart your Mac by going to the Apple menu > Restart.Ģ.

Make sure to check your Mac after each step to see if Outlook starts working again.ġ. Please try each step below one at a time. See also: Mac Mail App Opens Itself Randomly, Fix Outlook not working? If you are having a similar problem, here is how you can troubleshoot: Several factors may result in these types of performance problems. Some users have also stated that they were unable to launch the software. Another similar issue is that Outlook may become too slow to respond on your Mac. More specifically, Outlook may randomly crash or freeze when you want to check your email.

Is Outlook not working correctly? This article explains how you can fix when you have Outlook mail issues on your Mac.

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Outlook mac sync errors