Frustrating
Crashes regularly, the voicemails do not seem to sync: those that were deleted on O365 SfB server remain on the app, then crashes it when you select one. It does show unread voicemails in bold, which is more than the SfB 2016 windows client manages to do.
The app is able to call out to PSTN numbers & receive calls if you have cloudPBX and PSTN calling on your O365 plan.
Definitely needs work.
AMWireless about
Skype for Business, v6.4