Rated 5 out of 5 stars
I use TbSync in conjunction with the Provider for Exchange ActiveSync. It allows me a complete and reliable synchronization with my Outlook calendar and contacts . It is in my view an essential extension of Thunderbird in any Windows environment, a must-to-have.
At the time of writing this review, I have it installed with Thunderbird 78.5.1 (64-Bit) and Windows 10 20H2 x64. It works flawlessly.