Adding Holidays and Public Calendars
What's a calendar that doesn't have holidays marked? That's what I always think when seeing Outlook's blank calendar. Though Microsoft doesn't automatically load in the holidays, you can. One easy way to do this is to search for and add an Internet calendar to Outlook.
One popular Internet calendar directory is iCalShare. Its Top Calendars page lists calendars for US and UK holidays, moon phases, and more. (In Figure 1, you can see the US Holidays calendar is overlaid with the other calendar.)
On this and other web sites, you can add the calendars to Outlook by either subscribing to it or downloading it. Subscribing means that you add the calendar feed to Outlook. You'd automatically receive any updates or changes. Downloading the calendar means you'll import the existing data and you won't receive any updates.