that Microsoft doesn't have anything new and great to offer:
A "quick search pane," for example, allows users to type queries and instantly see matching files.
and
...Allchin stressed that Microsoft has broken new ground in Longhorn. For example, document icons are no longer a hint of the type of file, but rather a small picture of the file itself
If they expect people to upgrade to Longhorn just for these bells and whistles, they have got another think coming. BTW, Gnome and KDE have had equivalent features for quite some time.