BEST email client for Mac, Windows or Linux!

Shift is a good desktop email client that offers more than an email client. It gives you access to other web apps too. Shift gives you separate tabs to access Gmail, Calendar, and Google Drive within a single window. If you want to switch to a different account, just click the profile tab on the left side of the window. Like they mention on the site, Shift is all about streamlining your workflow, like a boss.