All the sent messages in my Sent folder pre-September 2007 have vanished.

I just recently synched this Hotmail account to the Mail feature on my Mac, but that doesn't have them either (although it seems to have taken all the messages from my Inbox dating back to 2001).

Is it possible to get these sent mails back? Some of them are very precious family communications that I really don't want to lose.

Thanks,

Krin