Lock-in... CalDAV has been a thing for a long time, and many (most) calendar apps outside google's own (and MS) do support this format. It's a bit wonky and sh

Lock-in... CalDAV has been a thing for a long time, and many (most) calendar apps outside google's own (and MS) do support this format. It's a bit wonky and sharing/interop are less than great. In the end, nobody is going to come up with a great server solution to calendar/mail/contacts because in the end, every effort I'm aware of has turned into a commercial solution because it takes a lot of time, effort and support. If I ever won a significant lottery amount, I would probably work on such a thing. Not sure I'd see any big benefactor for this any time soon.