Emails disappeared
My AVG virus scanner quarantined prefs.js finding "VBS:gamaredon". I suspect a false positive. I told AVG to restore prefs.js but when it did, all my email was gone. I went to the profile directory and all the email files are there, but I don't know how to restore the emails.
Solution choisie
I solved the probem. AVG quarantined prefs.js several times. I restored the first version that AVG quarantined and everything came back. It appears that when AVG quarantined the file, Thunderbird created a blank prefs.js ... which AVG continued to quarantine each new instance. The cycle stopped when I added the exception in AVG (but restored a blank prefs.js).
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Did it restore to your profile, i.e., c:\users\(yourID)\appdata\roaming\thunderbird\profiles\xxxxxx.default? If so, then start TB, if the account wizard prompts to create new profile, just click the Home tab in upper left, right-click and tick the Menu Bar option. Then, click Help>more troubleshooting information. Then scroll down to Profiles and click About:Profiles. then, click 'create profile'. Next, FIRST, create a name and the click to browse and select your profile and then click finish.
Solution choisie
I solved the probem. AVG quarantined prefs.js several times. I restored the first version that AVG quarantined and everything came back. It appears that when AVG quarantined the file, Thunderbird created a blank prefs.js ... which AVG continued to quarantine each new instance. The cycle stopped when I added the exception in AVG (but restored a blank prefs.js).
AVG/Avast said they fixed it a couple days ago so perhaps there is definitions updates in AVG.
It was indeed a False Positive as they confirmed both on forum and their twitter.