Was using Thunderbird for our e-mail. In June 2017, a Win10 update started to cause some computer system instability problems, such that log-in was impossibe, but a re-install was recommended. So, I did the reinstall and of course many of the programs on the computer were removed, including Mozilla programs. I got Thunderbird back, but I don't have any of the archived mail folders (i.e., local folders), and the address book is gone. I can't find a back-up location that may have that stuff saved. Am I out of luck, or is there a path to recover these connections. Thx!