Add the Sweep feature from the web app
Sweep let's you quickly set up rules and filter emails into folders. It is the only way I can deal with a large volume of emails. Please bring it to the desktop app!
Will Wilson commented
I agree with this. There are some web functions that would be great to have in the client and sweep is one of them.
If a user is using an Office 365 email account - bring the sweep feature to the client version! I frequently use it, but I always have to log on to the Outlook on the Web in order to utilize it.