Make a right click on the calendar you wish to share,
Than click share
Click add, and give proper permissions, to people whom you would like to
have access to your calendar
Click apply
Exit

Now a person who has access to one of those calendars will open his/her
outlook
Click on opened shared calendar, and will type the name of the calendar

Cheers
Oz.

To allow access to a shared folder that isn't one of the folders listed on
the File | Open | Other User's Folder dialog, the Exchange mailbox owner
needs to grant "folder visible" permission to the root of the mailbox and
any other parent folders of the shared folder, as well as appropriate
permission -- at least Reviewer -- on the shared folder itself.

The user who needs access then goes into Tools | E-mail Accounts or Tools |
Services (depending on the Outlook version), brings up the properties for
the Exchange Server service, and on the Advanced tab, adds the mailbox.

For more information on folder permissions, with how-to screen shots, see
http://www.howto-outlook.com/howto/permissions.htm and
http://office.microsoft.com/assistance/preview.aspx?AssetID=HA011134811033