I had this problem before and ended up losing everything and had to put in all the emails I had in Thunderbird. I had lost my addressbooks, folders, etc. It happened again. This time I might be able to explain it better. My computer crashed and restarted which it has done lately. So this time when I clicked my Thunderbird it says an upgrade may lose all by contacts, etc. I tried to get a screenshot or picture of the message but is it gone. It says I have Thunderbird 91.13.1. However I know I had downloaded 102 or whatever was the latest about 3 weeks ago when all this happened. I did back up (hope I did it right.) I did not backup this past week, but if I can at least preserve what I had I would be happy. Please understand I am really not a geek or computer savvy, so potentially losing all this stuff is stressing me. Please help me understand what I should do and if I understand this. 1.) It appears my Thunderbird somehow reverted to the old version. Should I download the new version first? 2.) I looked at importing but it does not give me the option of going to where I have my backup. It just gives me the choice of Outlook, Becky and SeaMonkey, Mork .mab (for addresses). If I download 102 first will I be able to get to my backup file I made? Thank you kindly for your answers. I am just afraid of having to start over again and having to sift through and sort emails like I did last time. I have included photos of what I have now.