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Right mouse click on the Puzzle icon at the top right of your browser. In addition, i notice that you have problem with uninstalling Outlook, it's suggested that you could refer to this article to uninstall Office for Mac: Uninstall Office for Mac.
Clean up all other installed versions of Mailbutler, e.g. ( Note: If the Finder forbids deleting the app because it's open, please open up the Activity Monitor application (in the Utilities folder of your Applications folder) first, find Mailbutler in the list and terminate it Move the Mailbutler application from your Applications folder to the Trash. Enter rm ~/Library/LaunchAgents/ and hit "Enter" to execute the command (this is fine to fail for older versions of Mailbutler). Enter launchctl unload ~/Library/LaunchAgents/ and hit "Enter" to execute the command (this is fine to fail for older versions of Mailbutler) If you do not have time to explore the manual way of uninstalling Outlook from Mac, you can use a special tool called App Cleaner & Uninstaller. Open up the Terminal app (in the Utilities folder of your Applications folder) If you have a Click-to-Run or an MSI installation, uninstall Microsoft 365 using the Control Panel or download the uninstall support tool. 
Press Cmd+Shift+G on your keyboard again and enter /Library/Mail, then confirm. Remove the Mailbutler.mailbundle folder. Enter /Library/Mail/Bundles and confirm. Go to Finder and press Cmd+Shift+G on your keyboard. If for some reason, uninstallation using the steps described above does not work for you, please follow these steps to manually uninstall Mailbutler: How to manually uninstall Mailbutler in Apple Mail In Mailbutler's menubar, go to Help -> "Uninstall…". 
Going to the Finder and from the Applications folder, launch the Mailbutler app. Please note: If you can't find the "Uninstall Mailbutler…" menu item in Mail because the Plug-in couldn't be loaded, please uninstall by:
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