Yes! Please put my vote for this also.
Actually someone had suggested this one year ago.
http://forums.x1.com/viewtopic.php?p=1921#1921
> a) easy way to search a specific folder (and/or its subfolder(s))
> within Windows Explorer (maybe also add X1 search into
> right-click context menu).
>
> b) the same applies to searching a specific folder in
> Outlook Express (or Outlook, Netscape, Eudora, etc.).
Rgds / Mr. Wong
"It is what X1 can do with the information found that is important."