outlook 2002

[Guest]

Hi,

I would like to know what software I need to allow
multiple users to access one MS Outlook Calendar.

The computers currently have Outlook 2002 and I would
like the users to be able to edit one central calendar
simultaneously, directly in the calendar (ie. not
requiring users to send emails etc.) What software beyond
Outlook 2002 do I need and is there any info on how this
is done?

Thanks Terence