I started my Mac Thunderbird 2 days ago and all of my email accounts were blank. Everything from the Library files were deleted. Anything to offer? This happened about 5-6 years ago. I can go into my TimeMachine back-up and redo the entire drive or, hopefully, less than that just all of the Thunderbird stuff in the Library section. Regardless, how the hell does this happen? This occured after updating to your latest version a day or so earlier. Great job guys.