Extract all attachments in an automated way?

I'm an email packrat. I have successfully imported 10 years worth of email into Mail. I was pretty impressed how seamless it was. These messages started off as Pine mbox files on a unix system, over the years they then were imported in Windows Netscape mail (back in the 4.04 days), later got imported in Windows Eudora, then back out to Linux Thunderbird, an finally now into Mac Mail. All while receiving new email from multiple POP and IMAP accounts sorted into multiple folders along the way. This was the first conversion that was seamless!

Now on to my question. There is an email, with a picture attached to it that I received several years ago. I need to find it. I do not recall which mailbox it went to, what time frame it was (other than a few years ago) and who may have sent it. Basically I just know what the picture looks like, and I know it came through email. After thinking it over, I think the only way I will find it is if I can somehow scan these tens of thousand of emails in some automated way and somehow detach all attached pictures files into a folder I can then browse. I've been googling for an applescript or tool that may make this happen. Anyone have any ideas on a way to dump all attachments from all of my existing email into a folder?