Thunderbird 52.7 and Thunderbird 62 Beta: When I copy or move an email from a subfolder in Local Folders into a subfolder under my IMAP account, TB syncs with the server and displays the Time/Date of synchronization in both Date and Received Date Columns. If I work offline, the original date is shown until I switch to Online ad then the same thing happens The server shows the original date and the message shows the original date when opened, and both the Date and Received Date are shown in the message source (and in the mbox file). Is this expected behaviour?