We are there as well. Most partners and clients use Windows. Most of them therefore had exchange and moved to the cloud. Most of them got 'Teams' for free in the package, chat and meetings.
Now we see a zoom link and go 'euuuuugh', yuck. hipster yuck.
Give me Teams
Upsides seem to be, its back to xmpp where we can communicate with anyone
Downside is, its total lock-in to microsoft.