Saving an unfinished PM

I was wondering if a "drafts" folder could be introduced to the PM system? If one happens to be in the middle of writing a PM and is interrupted (and if one is not the type to just waste energy and leave the computer running), then it could be quite helpful to save the PM in a drafts folder and resume it at a later point. I suppose one could export the text to Word and then from Word back to the PM on continuing the message, but that would be a bit...laborious ;-)