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Fastmail has been that all-in solution. They host Mail/Calendar/Contacts, and they used to host XMPP/Jabber. But unfortunately they made the decision to shut down XMPP (https://fastmail.blog/historical/shutting-down-our-xmpp-chat...) and probably for the same reason won't get into Matrix.

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> For intra-business messaging, most companies seem to be sticking with proven multi-user protocols like IRC rather than XMPP Multi-User Chat (MUC), or are moving to more sophisticated proprietary collaboration platforms like Slack.

That sounds true as of 2015, however Matrix now has a large following in open source & in some governments & businesses. I can't find a list of orgs using Matrix but that would be interesting to see.

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