The 10.1.x series of desktop clients include an option to use the 'Global Address List' to lookup users.
The global address list (GAL) is updated only every seven days and users who create their accounts after
you receive your GAL will not appear. Entering the user's Internet ID or doing a complete directory
search will locate these users.
To force a GAL update, either sign in as a different user in the desktop client or exit the client and
delete the GAL file. The GAL file for the Windows desktop client is stored in the user's
application data folder:
C:\Documents and Settings\<username>\Application
Data\Oracle\Calendar\Global Address List.gal
Note: version 10.1.1.0.2 of the Macintosh desktop client currently refreshes the GAL at
each login.