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@patrickrhone Fastmail is built on open standards. Mail, calendars and contacts all can be used via standard protocols(CalDav, CardDav and IMAP). They participate in pushing the IMAP standard forward and are developing JMAP for better interop with the web and client apps. Due to a deal with Apple, they are one of the few IMAP providers that do true push notifications with IOS. It really is a fantastic service.