One of Windows Vista's new features is the built-in calendaring program, called Windows Calendar. It provides functionality similar to Microsoft's Outlook calendaring feature, but unlike Outlook there is a separate application called Windows Mail for managing your email.
Some of the Windows Calendar features include: sharing your calendar with others, creating multiple calendars for different events, and publish the calendars for others to subscribe to. You can also color code calendar items, search for specific appointments and tasks, and set up recurring events or add reminders to appointments.
To access Windows Calendar, open the Start menu, in the Search field type Calendar then press the Enter key.