Probably the BEST and only feature I still like Outlook for, is their Sweep feature. This allows the user to MOVE all email from a specific sender to delete folder (or any other folder) immediately. As well as it has the option have it automatically MOVE (or any folder) from a sender after it is 10 days old or to move all except the most recent email from the sender. This feature is fantastic for getting rid of old email that is unnecessary.
No need to try to do a search on a keyword and try to find only the email you want to delete and selecting all from multiple pages. It is a very simple process to delete/move the files. I always wished Gmail would add the option considering they have been around for so long and they still have a **** way of deleting email on their platform. However, with me working on migrating my other email accounts to Proton I am already missing this very handy feature.