In September, we introduced a new vision for intelligent communications including plans to evolve Microsoft Teams into the primary client for calling and meetings in Office 365. As part of this, we a...
Updated Jan 26, 2021
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probich0 that will depend on many factors but mainly feature parity. Currently Teams does not have all the features of SfB on-prem which will be a deciding factor for many larger enterprises doing EV today. Migration options today are limited to a side by side method which assumes that users are already in the cloud (see https://blogs.technet.microsoft.com/skypehybridguy/2017/10/24/journey-to-success-with-microsoft-teams/)
I would expect/hope that there will be more options coming for SfB on-prem EV customers but for now its a wait and see approach especially until feature parity is met. If all the calling features you need are present today you would have to start moving users to SfB Online first and then simply change their calling capability to Teams in the client calling preference. You can still run both SfB and Teams side by side as users get confortable changing over to just using Teams. There isn't a physical move you need to perform per se from SfB to Teams but expect that there will be more information coming on controlling the user experience when it comes time to stop allowing users to have both SfB and Teams client running side by side.