I followed instructions in article about supporting multiple versions of Visual Studio in developing checkin policies. Now, where can I find :
Microsoft.Team
These have been moved into a Nuget package.
They're also stored under the "CommonExtensions" folder of your Visual Studio installation, but these are not meant to be referenced anymore, that's what the NuGet package is for.
C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer
We can find in:
C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer