On March 24, Microsoft announced new rules for licensing Teams Rooms Devices. Instead of being able to assign a user subscription license (like Office 365 E3), tenants must assign a Teams Rooms Pro or Teams Rooms Standard license to the room mailboxes used by devices. If they don’t, the devices won’t be able to connect after July 1, 2023. Microsoft suggests a script to find licensed room mailboxes. It’s OK, but we can make the script run much faster, which might just be important in the types of tenants that use Teams Rooms devices.