Allow MS Teams via Conditional Access but block other O365 Services

Thank you very much for this detailed response.  This is exactly what we are bumping into also.  We have folks using Teams (as expected) - on many different devices but we obviously do not want to grant EXO access to any device - thus we are stuck with the CAR stuff which is a major shortcoming.   We are exploring using a solution from Palo Alto - Prisma VPN - to insure that our fleet of "compliant / trusted" devices can have secure access to EXO from anywhere..  This feels beyond ridiculous but not sure we have any other options.  Again - thank you for taking the time to detail a great response here.