With this change, Microsoft and Apple will also block the Zoom & Webex plugins in Outlook for Mac for both Microsoft 365 and Outlook 2019. With the release of MacOS Mojave and Catalina, Apple blocked most injection-based plugins from running due to security & stability concerns. We are reaching out to customers who use injection-based native plugins so that they are informed and can work on a plan to migrate to the Office Web Add-ins available through AppSource, Centralized Deployment, or sideloading. Please continue to migrate to the supported add-ins if you use either Zoom or Webex. We have instead, worked with Apple, to only block certain plugins in the next major macOS release (12.x). This version will likely go live sometime in the Fall of 2021. Thus, we will no longer block all Injection-based plugins.

This would block core workflows for our customers that use these plugins. Updated on May 25th, 2021: We have recently been made aware of certain Data Loss Prevention plugins that do not have add-ins replacements available.

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