If you don't have Microsoft Office Outlook in your machine, then
how do you search for people in your organization (assuming they are listed in your
organization's Active Directory)?. With Windows XP you can use the Address Book Applet
to do it. In Windows Vista there is no stand-alone program or shortcut (searching
for People yields nothing useful) to do this. The answer I found out is to run the Network Applet
( Start->Network) and then click on the Search Active Directory button
in the top tool bar.
(The Network Applet in Windows Vista showing Search
Active Directorybutton)
This brings up the applet Find Users, Contacts and Groups. Using this you
can search for People, Computers and Printers (Entire list shown below)

This is fine. But is there a way to get this applet as a shortcut on your desktop?.
Yes, there are two ways to do that:
-
This is the easiest, launch the Find Users, Contacts and Groups Applet and
select File->Save Search menu option to do this.

-
The second is to create a shortcut from Desktop and type in rundll32.exe dsquery,
OpenQueryWindow. Then save it by giving a name like Find People.
Read the complete post at http://www.venkatarangan.com/blog/2008/08/18/Vista+Find+People+In+Your+Active+Directory.aspx