It's just the convenience that is compelling. If you already use Office365 the integration with outlook for web (and desktop for that matter, which I rarely use

It's just the convenience that is compelling. If you already use Office365 the integration with outlook for web (and desktop for that matter, which I rarely use) is really neat and for the most part "just works". I've got some seriously non technical people in the business who find it super easy to now arrange a conference call, when previously they would be using their iPhone on speakerphone to merge calls.