if you don't use exchange, you need another server - see
http://www.slipstick.com/outlook/share.asp

exchange should be doing everything - you don't need mail hosted outside -
and even if you decided to keep it outside, you could easily configure
exchange to handle both the outside mail and calendars seamlessly.

--
Diane Poremsky [MVP - Outlook]
Author, Teach Yourself Outlook 2003 in 24 Hours
Need Help with Common Tasks? http://www.outlook-tips.net/beginner/
Outlook 2007: http://www.slipstick.com/outlook/ol2007/

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"blaiddbach" wrote in message
news
At present we are running muicrosoft small business server 2003 and
exchange
server with facilities to share various calendars. Do we need to be
running
exchange server for shared calendars or is there another way? What we
want
to do is stop using exchange server and have all our e-mails hosted by one
company.