Option "Share my calendar" does not appear in Navigation pane. When "Open a
Shared Calendar" is clicked in Calendar Navigation pane> error "The
connection to the Microsoft Exchange Server is unavailable. Outlook must be
online or connected to complete this action." System can send and receive.
Also "Resource Scheduling" button is grayed out in Tools>Options>Calendar
Options. All other users using same software can share.

Outlook 2003 on WinXP SP2 all patches up-to-date.
Tools>Options>Other>Advanced Options>Add-in Manager
Delegated Access
Deleted Item Recovery
Exchange Extensions commands
Exchange Extensions property pages
Server Scripting
all installed and checked

Any ideas?