Add metadata, improve search (Score 1)

I agree with Slartibartfast. The main points are to 1) add metadata and 2) improve search capability. I haven't read all posted comments (apologies for any redundancy) but in MSOutlook, one can add "categories" and then mail can be sorted accordingly. I'm not aware of a limit on the number of categories, but they can be added easily and on-the-fly. Also, the search feature is OK, though a little clumsy and it can't search over multiple mail archives. Bottom Line: leave mail in one folder, add categories, search/sort.