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Moved from SOGo to Grommunio [0]. The ActiveSync support from SOGo was fairly flaky, plus Grommunio has EWS support.

Interesting alternative. It was a bit muddled to figure out what it consists of, but this lists most:

Chat bit was unclear:

> grommunio-chat is a fork of an open source chat platform with authentication and integration enhancements

Looks like "an open source chat platform" is mattermost?