Prepare to Share
Calendars often have private information that does not
need to be published on the Internet or on your local network. What
are your options?
Try It: Review the Calendar Options
Go to
Tools-> Options -> Preferences.
Select Calendar Options.
Click on Free/Busy Options.

What Do You See? The Free/Busy Options publish
your availability on the network. You can choose how many months you
wish to publish and how often your calendar should synchronize or
update the Exchange Server.
Memo to Self: Free/Busy
options work with a Microsoft Exchange Server as well as calendars
you publish on the Internet.