No, sharing can only be set up by users with the Outlook desktop program.

Signature
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
>I am trying to open up and share my calendar with specific others on an
> exchange server. I am using web-access because I work off-site. The online
> help from Microsoft doesn't address sharing from web-access - can it be done?