Source: https://techcommunity.microsoft.com/t5/microsoft-teams-blog/5-things-you-may-not-know-about-the-free-version-of-microsoft/ba-p/1987473 1338832555869687810

Source: https://www.microsoft.com/en-us/microsoft-365/blog/2020/12/01/restore-and-maintain-personal-connections-with-new-microsoft-teams-calling-features/

Source: https://www.microsoft.com/en-us/microsoft-365/blog/2020/11/19/bringing-personal-features-in-microsoft-teams-to-desktop-and-web-now-available-in-preview/ 1329922472121131012

Source: https://developer.microsoft.com/en-us/microsoft-teams/blogs/?p=4590 1262769985660821506