I've been using Thunderbird as my PC's mail reader for years. I had a problem with the most recent update of Thunderbird (about Nov 8?). It gave me an error message when trying to download my primary gmail account's new emails. To see if the problem was Thunderbird or GMail, I tried reinstalling an older version 91.3.0 (64Bit) on an updated Windows 10 desktop. During install, it told me I had to create a new user profile, I did and told the installer to copy my information. After it installed and started, it found my gmail account and showed ALL the messages, but it did not show my contacts, other email accounts, local folders or any of my saved emails. I checked file manager and it under appData/roaming and AppData/Local I have two profiles folders, one XXXdefault-release, the other YYYdefault. I'm assuming one of these is my old profile, but I have no idea how to get Thunderbird to retrieve the correct data.