I found an interesting article (especially the last part)
about groupware and calendar from Jamie Zawinsky, a former lead
developer at Netscape.
The article : Groupware
Bad
.
It's a bit pessimistic but his thoughs about calendaring
are simple but so important to take care at, since we want to
build a great groupware solution.

(Post originally written by Eric Barroca on the old Nuxeo blogs.)