Looking For Collaboration / Communication Tools

Hello,

I have to manage a project among 30 individuals all across the world, and am looking for real collaboration / communication tools to facilitate this. Email and calendar real-time updates are the most important. We need these updates to be available to the whole group, while having the ability (from the manager / administrator?s point of view) to change viewing settings among particular team members. Any suggestions?

Thanks for the help in advance.