They're pushing skype for business in my workplace as well (larger corporation). We've been using zoom and the IT department keeps telling us to stop, but skype for business just doesn't work well: high memory usage (seen on multiple machines taking 20gb+ before having to be killed), lack of features (e.g. video conference recording), instability, general flakiness of software. It is truly bizarre all of the problems given how long the software has been around. The only thing I can believe is microsoft is not putting the resources needed into it. They will fail unless they change that quickly. Us engineers will pay for zoom out of our own pockets before using skype for business.