Calendar management system wanted

[Susan Richter]

We're looking for a calendar management package to run under (4.3bsd)
Unix that will (besides doing the basic things like scheduling
appointments, summarizing calendar, etc. for a single user) allow a
user to do the following:

    -	scan/query his own and others' calendars

    -	give a list of users and a range of time, and get back a list
	of times when all the parties are free

    -	make a non-binding "appointment" on someone else's calendar

Anybody know of, or have, such a system running?  If so, I'd like to
hear from you!  Thanks . . .

				Susan Richter
				richter at rand-unix.arpa
				...!{decvax,trwrb}!randvax!richter