Microsoft Teams will eventually become the standard collaboration tool for Office 365, replacing Skype for Business Online. In the meantime, you may need to manage how your end users will use both products, as well as how to transition fully to Teams. This article will discuss what options are available to you, how to manage this on a per-user and tenant basis, and what is on the roadmap.

Read my full post over at the 4Sysops Blogs:

https://4sysops.com/archives/understanding-microsoft-teams-coexistence-and-upgrade-modes/