Related fun story:

At one engineering organization, the CEO said we are switching to Teams due to better Office integration.

The whole engineering org, like 30+ people, just ignored it. I was a manager during this time and was also asked to switch my team to Teams. I think I just said everyone had it installed and checked that OKR...

So for like six months Eng was on Slack and the rest of the org stayed on Teams, and then the CEO left and I am not sure if anyone is still using Teams there...