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Revisit: Microsoft Teams Calendar through WAF


This is a follow upto an old thread from about a year ago: (that thread is now locked)

I've tried again to enable WAF for Exchange 2016 on-premise but encounter the same issue: mail flows fine, everything works for hybrid users in Exchange Online, but users with an on-premise mailbox can't see their Teams calendar (must be still something to do with EWS coming in to the Exchange on-premise from Teams).

Has anybody made any progress with this, or found a solution?  I really want my Exchange 2016 servers behind the WAF rather than direct NAT rules. We're using the latest UTM firmware (9.711-5)

Thanks in advance!

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