Published February 28th, 2012
If you have an email selected in Thunderbird and you accidentally press the "a" key when trying to type in another window then your email will disappear. Here is how to get it back
The "a" key moves the selected email to the "Archive" folder which you will find at the bottom of your Inbox folder list, after your Sent Items folder.
There will be an Archive folder for each year that you archive mail and you will find the missing email in the folder for the current year.