Probably because your permissions on the two folders are different.
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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
> Why is it I can open appointments in a shared calendar on one computer but > not another?