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https://bugzilla.zimbra.com/show_bug.cgi?id=93640
93640 – "Undefined" entry is added if "ZIMBRA" is selected as "Free/Busy Interop Provider:"
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https://help.boomeranggmail.com/category/231-share-freebusy
Share Free/Busy - Boomerang for Gmail Help
Share a live view of when you're busy
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https://docs.iredmail.org/sogo.free.busy.html
SOGo: per-user free/busy availability
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