It is working on Chrome OS on a chromebook, and it works on Android on a phone. Under Windows 10, on Chrome browser, it is just totally broken. Opening mailbox often displays only a spinning wheel. Writing a new email, hitting send, gets a sending wheel and then the mail is lost. no draft saved. What is wrong? Do none of the developers actually use this product? Did you allow people who have no idea of a functional browser mail client to do this design? This is unusable and just horrific.