Last Updated: July 23, 2019
We have identified an issue where macOS (primarily running Mojave) screen flickers on some of the iMac machines when using Outlook for Mac.
You are most likely using an iMac (Retina 5K, 27-inch) machine. While using Outlook for Mac, the screen flickers and you need to reboot the machine to clear the issue.
Apple has identified the root cause for this issue and has addressed it in their upcoming major macOS release (macOS Catalina version 10.15). Until this release is generally available, users are advised to apply the workaround described below.
Open Outlook in Low Resolution Mode. We understand this is not an ideal workaround, but it can help until the release of macOS Catalina version 10.15.Setting Low Resolution Mode
Go to the Applications folder.
Go to Get Info by performing one of the following tasks:
Right click Outlook and go to Get Info.
Left click Outlook, choose file, and select Get Info.
Left click Outlook, press the Command key and the letter I.
From the new window, check the box next to Low Resolution Mode.
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