Using classic Outlook for Windows in business environments
If you deleted everything out of Onedrive, which you have to do online at Onedrive. com, you also have to delete the Recycle bin that is in Onedrive, on top of emptying all your email folders. It might also be a good idea to start unsubscribing from email recipients you don't use, like that shopping site you made a purchase with and only signed up to receive their alerts and newsletters to get that 10% discount.