Figure 4-3. Publish calendars Configuring iCal Server Published calendars are really helpful for very specific environments (i.e., ones in which one person is disseminating calendar information to others). Although you don't need to have a server to share calendars, it sure gives you a lot more options, including granular control over who can access which calendars, how they can be accessed, and what can be done once accessible. But, to fully understand how much iCal server changes the game from just publishing calendars, let's turn it on and take a look. To enable iCal Server, a server must first be running a directory service. Configure iCal Server in the Server application. But first, complete the Next Steps (see Chapter 2 for more information on doing so) section in Server. Once completed and running as a directory server, click on the entry in the Server sidebar under SERVICES for iCal. iCal Server can send email invitations on behalf of the server. If you want the server to be able to send invitations, check the box for "Allow invitations using email addresses" and then click on the Edit button (Figure 4-4), which launches the Email address wiz- ard. At the Configure Email Address screen, provide the email address that notifications will come from and click Next. At the Configure Server Email Address screen, configure the type of mail that the address uses. This involves filling in the incoming mail server type (IMAP versus POP), the server address, the port number, the username and the password for that address. These are typically provided by your Internet service pro- vider or mail host. Click on the Next button once configured and then provide the address for the outgoing mail server (or SMTP server), the port number (the default setting will work unless your email host requires a separate address), the authentication 76 | Chapter 4:Sharing Address Books, Calendars, and iChat