I have used Thunderbird for many years and use the Gmail folder "All Mail" frequently. After a computer crash I was forces to clean reinstall of Windows 10 leaving my personal files intact. This reinstall removes all the software that Microsoft does not like including Thunderbird. I eventually downloaded ''Thunderbird 78.'' All the standard Gmail and my personal folders down loaded and established correctly and I was very pleased until I discovered two aspects of the down load vis: 1. The "All Mail" folder is missing completely. It is also missing in "Accounts/Synchronization and Storage/Items for offline storage". 2. My "Sent" folder only shows the emails I have sent since I downloaded Thunderbird. Earlier "Sent" emails do not show up. Looking directly into my Gmail account I see that "All Mail" and "Sent" mail are perfectly normal. but for some reason do not transfer to my Thunderbird program. My computer and all it's various programs otherwise appears to be completely normal. Any help you could offer would be appreciated. My thanks to you all at moz://a - have the best possible Christmas and New Year despite your dreadful Covid difficulties. Regards Tony Moore