Type the following commands in Terminal, and press Enter after each line: defaults write com.microsoft. In Spotlight Search, type Terminal, and then double-click Terminal in the search results.Make sure that Finder is the selected application, select Utilities on the Go menu, and then double-click Terminal.Open Terminal by using one of the following methods: For information about this update, see MS16-070: Description of the security update for Office 2016 for Mac: June 14, 2016. Select the checkbox next to a failed font, then click Remove Checked. A green icon indicates the font passed, a yellow icon indicates a warning, and a red icon indicates it failed. In the Font Validation window, click the arrow next to a font to review details. If your Outlook installation is not at version 15.23 or a later version, install the June 14, 2016, update for Outlook 2016 for Mac or a later update. In the Font Book app on your Mac, select a font, then choose File > Validate Font.View the version number that is listed.On the Outlook menu, select About Outlook.Step 1: Check the Outlook for Mac version number Then, disable the preview feature for encrypted email messages by running a command in Terminal. To fix this issue, update Outlook 2016 for Mac to version 15.23 or a later version.

In Outlook 2016 for Mac, when you navigate to a folder in which several encrypted email messages are displayed in the message list, Outlook freezes or experiences other performance issues. Outlook 2016 for Mac freezes on email folders that contain several encrypted messages