You're ignoring enterprise, there is a huge industry around business email hosting which more often than not uses an email client (and more often than not that

You're ignoring enterprise, there is a huge industry around business email hosting which more often than not uses an email client (and more often than not that client is outlook or the iphone mail app). Google Apps was certainly taking a huge chunk out of enterprise, but I don't know if that's still happening now that you have to pay for it from employee #1. Outlook usage is so embedded and big enough that Google built a sync app, but moderately funnily, the 'how to integrate google apps with Outlook' video on this page is missing, not sure if that's a reflection of how few people use it? https://support.google.com/a/answer/33322?hl=en https://support.google.com/a/answer/33322?hl=en