While I tend to keep my e-mails I've also realized that the attachments in the e-mails that I have eats a few bytes. So I'm wondering if anyone are aware of a plug-in or utility that could mass remove and safe the attachments? Having saved the attachments it would be faster to check through the files and delete was should be deleted and safe what is needed to be saved.
Well, guess that I can now answer my own question; I found an excellent plug-in called Attachment Extractor (https://addons.mozilla.org/en-US/thunderbird/addon/556) for Thunderbird and it does the job and a little bit more.