Take a look here, it may help:
http://www.slipstick.com/outlook/share.htm

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Milly Staples [MVP - Outlook]
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After furious head scratching, johncat asked:
| I have Outlook 2007 that I use the calendaring feature very
| heavily for both personal and work scheduling. I schedule ALL family
[quoted text clipped - 10 lines]
| other options are there, and what would be the best way or two to
| accomplish this???? Thanks!!! John
Michael - 11 Mar 2008 16:04 GMT
I'm in a similar boat. I have a small business that uses Outlook for pop3
email and calendars. If I put a sharepoint server in place, could I use the
sharepoint server to share out the personal calendars, and possibly create
group calendars?
> Take a look here, it may help:
> http://www.slipstick.com/outlook/share.htm