Microsoft has released a new Add-in for Office 2003, Outlook Calendar Views.
The Microsoft Office Outlook 2003 Calendar Views Add-in makes it easy for you to view your Outlook Calendar appointments through a filter that is based on Outlook labels and categories. For example, you can create a view that shows you only the appointments on your calendar that are labeled Must Attend, or are categorized as Important.
You add filters by using the Calendar Views toolbar, which opens in your Outlook Calendar after you install the add-in.