Hi Sounds like a big job! I have used Quick Tools for this purpose but I only do this as the e-mails come in. Quick Tools is a handy utility for stripping attachemnts, sending e-mails again and removing the >>>>> from forwarded e-mails.
Version 4 costs but I have been using version 2 for some four years on ME and XP. This free version (OEQT)can be downloaded from