If you find that an add-in that has been installed is causing a problem, disable it. For this, in Outlook, go to File menu >Manage Add-ins. This action will open ‘Outlook on the web’.
The new Outlook for Windows and Web will soon deal with old emails in an organized way, making them easy to follow.
You open Outlook to check your email ... However, you can try clicking on the PST file, choosing Properties, and ensuring ...