Re: ...as if.
Indeed. It's not 2000 any more, and you don't need to choose between "Microsoft" and "Linux". Where I work e-mail, calendars, and lots of other stuff, are provided by Microsoft cloud services, but a lot of people (perhaps most) access those services from a client (web browser with plug-ins) running on Linux or Mac. Microsoft may well be using Linux in their cloud; it's none of our business as long as it keeps working.