You can use Outlook's Namespace.GetSharedDefaultFolder method to return any other user's Calendar folder that you have permission to see.

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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> What is still un clear to me is how will I get the appointment data for all
> the users from the calendar. When I open my Calendar view from the server i
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> server ? Should i run this script on the machine that has the exchange
> installed ? Or are there other work-arounds ?