User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:18.104.22.168) Gecko/20070914 Firefox/22.214.171.124 Build Identifier: version 126.96.36.199. (20070728) I selected all emails in my Inbox (+600) and moved them to Sent. Then I hit Undo from Edit-Undo. The emails seemed to come back to Inbox. Then I went to Sent, come back to Inbox and ALL disappeared. No emails, the size of the Inbox file was 0, etc. Reproducible: Didn't try Steps to Reproduce: 1. 2. 3.
There is a special circumstance. The inbox was big (+300Mb) and the HardDrive didn't have enough space. Thunderbird did not give any error though. Just wondering maybe this has something to do with the lost.