Exchange is a corporate level application server that does cost $$$$$. See here for more options: http://www.slipstick.com/outlook/share.htm

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Milly Staples [MVP - Outlook]

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After furious head scratching, dale asked:

| home user of outlook 2007. trial version. want to set up calendar
| sharing with family .. not sure how to do this. have looked at
| online help ... a bit confusing. do not understand "exchange" server
| referenced and if there is a cost for this.