Solutions for E-mail indexing/filing?

[Jim Hickstein]

> What would be very ideal, would be a system where, when I file an e-mail
> into a subfolder, I can also add a tag to that e-mail, and have
> that e-mail indexed into a database of sorts.. I can then put a description
> on that tag, and associate it to a customer, project, etc.
> 
> Has anybody come accross something like this?

Also see "intertwingle":

  <http://www.mozilla.org/blue-sky/misc/199805/intertwingle.html>

Not a solution, as far as I know, but an interesting idea.