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Re:FastMail: Shutting down our XMPP chat service by brazeon on Monday November 16, 2015 @12:52AM (#10572855)
So how this works with federation? I don't see any open/common API.
Re:FastMail: Shutting down our XMPP chat service by rekoros on Monday November 16, 2015 @10:09AM (#10574811)
It's "federation-as-a-service", basically.

A common use case is federation between two Slack teams (share a channel).

Another common use case is federation between a group in Skype and a channel on Slack.

Or IRC and Telegram, etc.

Making existing systems work together really well is priority one. API only makes sense once that's done.