The Calendar navigation pane has a link for a How to Share Calendars article that explains the different features available to do this.

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Sue Mosher, Outlook MVP
Author of Microsoft Outlook 2007 Programming:
Jumpstart for Power Users and Administrators
http://www.outlookcode.com/article.aspx?id=54
> Hi,
> I want to share my Outlok calendar with my Colleagues through 2007. Can you
> pl explain how to go about sharing the same without purchase of any other
> shareware.