Winmail 10 and Thunderbird

[Doc Spratley]

I have a number of emails from different sources required for my job. I use Thunderbird as a common program which spans all sources. When I originally installed Win 10, I had no problem with the new Winmail program showing all my folders, etc in Thunderbird, but since the last update of Windows, this has stopped. I have tried all options to get my folders back, but nothing I have tried has worked.

Does anyone out here know how to solve this problem?? Why is it only happening in my Outlook accounts, not the many others?

HELP PLEASE