Implement following steps to update Outlook for Mac:ġ. If you are using Mac OS High Sierra or its previous version, then you have to go to App Store and update Mac OS version. Open System Preferences > Software Update. To update Mac OS, implement the below steps:ġ. Outlook for Mac Keeps Crashing at Startup? Try the Below Solutions Solution 1: Make Sure that Mac OS and Outlook are Updated Here are some simple and effective solutions to solve this problem. In this article, let’s take a look at the solutions to fix Outlook crashing on startup. The most common issue that the users face is that Outlook for Mac keeps crashing at startup. Although Outlook for Mac is a great email application to use, but many users can run into problems when using it.