iCalendar Plugin for Outlook?

Does anyone know of an iCalendar plugin for Outlook? My searches haven’t turned up anything.

UPDATE: ‘Subscribing to an iCalendar’ means: you enter the URL of the iCalendar into your calendaring software and specify a refresh schedule. Then your calendaring software goes and looks for new data to update the iCalendar on that schedule. It’s very, very cool.