No, guests do not need to have Microsoft Teams installed to join a meeting .

When you send a Teams meeting invite, participants can join using any of the following options:

1. Via Web Browser - They can click the meeting link and select Continue on this browser to join without installing the app.
2. Via the Desktop or Mobile App - If they do have Teams installed, the link will open in the app automatically.
3. By Phone - If the meeting includes a dial-in option, invitees can join by calling the provided phone number. Example: