Vote for Exchange GroupCalendar
Exchange GroupCalendar integrates with Exchange server and needs no software on the Outlook workstations to give you one, two or twenty Group Calendars. After the '3 step' server configuration your GroupCalendars are ready for use, just one click away for the Outlook users who participate in the GroupCalendars without the need for them to do anything other than what they normally do, keeping their personal schedules up to date. The Exchange Server takes care of updating the GroupCalendars.