Not solved years later, March 2022: Many people use Outlook for work and without a lot of the basic capabilities of Outlook for Windows, this app is unusable. You can't even put a company logo inside of your signature. You also can't do something as basic as adding custom tags to events. Until the Outlook app adds some functionality to help people with Office 365 for work, I can't say I would recommend it unless you're only using it for basic personal email. Looks nice though.