Can this program recover deleted Facebook emails from webmail?
Facebook's old official line is that once a message has been deleted, it is gone forever. If everything lines up correctly however, there is a possibility of getting a message or a message thread back as long as you got an email from Facebook announcing the message. I just tried it to make sure I wasn't giving you false information, and it worked!
"In a delete confiormation email, Facebook gives you an undo link which works if the email was deleted recently"
Show Deleted Messages
The first thing is to check and see if you got an email in your regular email account saying that you got a message from someone. If you did, and you still have that message in your inbox, then all you have to do is click on the link that is at the bottom of message in your email inbox. That link will take you to Facebook and the message center, even though you deleted that message or message thread. Under the message title, you will see a notice that you deleted that message or thread. Right next to that, you will see a link that says: Show Deleted Messages. Click on that, and the message or message thread magically appears just as if you never deleted it.
You may encounter a problem if you deleted the email from your inbox that gave you the Facebook message notification. If you did delete the message, did you empty your delete folder? If not, then look there - do a search under "Facebook" if you have a lot of messages and aren't sure when the original message was sent. If you did delete the message and then empty the delete folder, then you are going to have to go through a few more steps to recover that deleted email that contains the link to the Facebook message.
In this instance, where you have deleted an email and then emptied the recycle bin or deleted email folder, a program such as Data Recovery Pro can help you. The program will let you preview recoverable files and has a good customer support base in case you have a problem. Once you have recovered the Facebook email with the link to the message, you should be able to follow the above steps and see your message thread.
If this was simply a message that you sent, and didn't get a reply on that thread in your email inbox, then you very well may be out of luck. I have not found any other way to recover deleted threads or messages.