I am one of the few people in the world who never was hooked on Candy Crush, the diabolical candy puzzle that became popular thanks to Facebook and smartphones. It just seemed so boring, and at times the layouts were made so the player would have to spend hours on end on the same level. I prefer Tetris.
I just used Outlook recently, and it's confusing. Maybe I just got very used to web-based mail clients. One more thing, I use a company email on Outlook and every new session, it warns me about a certificate something, what is it for?
Ubuntu. That's the most popular one, I believe. Personally, I mostly use distros related to networking. I also like lightweight distros since they are more appropriate for several old computers I have and that don't support well newer operating systems.