I’d be surprised if there’s even 200 million GSuite (not free gmail account, since that’s not for commercial use) accounts active. They have like no market share in enterprise outside of schools. (I’ve never met anyone who wasn’t at a school that used GSuite. Which shows the circles I’m in, of course, but I think there’s a weird HN bias where people think that companies outside of smaller shops are using GSuite. Exchange is still good and cheaper than ever.)