Microsoft Teams Driving Adoption for Skype users.

To me personally when it comes to adoption, it is not what users need. If that is something they really needed I would not have to think about an effective adoption strategy to drive them. There are several reasons for technology transition. It's not only because the new technology is based on user need, but also the trend, the TCO or being aligned with the corporate digital transformation. 

I'm not a fan of Skype nor Skype for Business. To me these tools are only helpful for "calling" (not even video if you don't have good internet connection). This turns out a result of going back to the old fashion which is IM. It's undeniable to say that video conference is more effective for a discussion than chatting but I've seen most of my customers have other video conferences such as Polycom or Cisco which are costly. And their users prefer IM for regular discussion (product idea, product execution, non-technical stuff ...). Folks say that Skype for Business can be used to chat with external people. Unfortunately during my work from small to large businesses, I rarely see such a collaboration on Skype for Business, except meeting invite with an URL :). 

Microsoft Teams is not something magical but to me it is an innovative social tool which competes with the others over the market (e.g. Slack, Facebook Workplace, even with Yammer in particular ...).