The Exchange ActiveSync thing from Microsoft is probably the most used protocol for synchronizing mails, contacts and calendars. Given its proprietary nature there must be tremendous efforts done just to understand how it works, so it's not for me.
Moreover, more and more uses of email go through the web and IMAP is an afterthought. Tutanota can send end-to-end encrypted emails... if both parties access emails through the web interface. Or it's a link to an encrypted message, but then you have to send the secure link/password some other way. ProtonMail does the same, if you want IMAP access you need to install an additional software on your machine.
IMAP used to be everywhere, but because people like shiny things it is slowly seen as a bad thing we should get rid of
Moreover, more and more uses of email go through the web and IMAP is an afterthought. Tutanota can send end-to-end encrypted emails... if both parties access emails through the web interface. Or it's a link to an encrypted message, but then you have to send the secure link/password some other way. ProtonMail does the same, if you want IMAP access you need to install an additional software on your machine.
IMAP used to be everywhere, but because people like shiny things it is slowly seen as a bad thing we should get rid of