Hey Geoff,
I have an O365 E3 account I've tried to setup UM against.
Haven't really looked at the Lync but I assume if you have
the telephony on Sipx, you might be able to dispense with
Lync on premises and keep it all in the cloud. As for the
UM, I'm trying with 4.6 and have been unable to negotiate a
TLS session (require for Exchange online). The client cert
is requested from the Sipx but isn't being properly provided
in the handshake. I suppose an issue needs to be created
for it. In any event, I'd be happy to email or talk
off-list and pass on what I've learned (including some fun
with Microsoft TAC). My email should be publicly visible.
John Lightfoot
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