Atollon Calendar is really simple to use feature, see the bacis view below.
Advantage of using Atollon Calendar is the fact that it's part of your sales or service delivery process. Calendar events may be tracked in relation to your clients, deals, projects, etc.
Atollon calendar is also integrated to your time tracking, resource management, etc.
Events have different colors - header color according to user, body is set by type of event
You can swith to multi-user calendar using 4th icon on screen bellow.