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You may be able to:
Go to C:\Users\username\AppData\Local\Microsoft and then right click on the Windows Live Mail folder and choose 'restore previous versions'. Then choose the most recent date to restore to and click restore. After restoring to a previous date, you can always restore back to a future date.
You would then need to make sure that you move all the mail to a safe folder as it may delete them again when it synchronises.