You can subscribe to PIMB calendars using iCalendar, a standard for sharing event information. If you are using Apple iCal, you should be able to simply click on the link and you will be subscribed to the calendar.

If you are using Mozilla Sunbird, you'll need to copy the link and paste it into the appropriate place to subscribe to an external calendar.

If you're an Outlook 2003 user, you have to install a plug-in to make it recognize iCalendar files, since Microsoft just doesn't like standards. Click here to go to the download page. Please make sure you read the "README.txt" file in the download package.