There is a chance that you are facing Mac Outlook search not working issue because there are special characters in your Outlook profile name. To get rid of this problem, you need to rename the main profile. To do so, you need to select “Applications” from Dock. After that, search for Microsoft Outlook and then right-click on it. After that, choose the option of “Show Package Contents”. Then, go to “Contents” and select “Shared Support”. After that, click on Outlook Profile Manager. Check if there are any special characters in your profile name. If you see any special characters, then change the name of Outlook for Mac profile folder. https://prompthelp.us/blog/outlook-search-not-working-in-windows-10/