To improve general user experience Microsoft has just released a new document: Best practices when using the Outlook Calendar.
This document applies to Outlook 2007, 2010 and 2013.
“The Outlook Calendar fully integrates with email, contacts, and other features. This integration makes the Calendar component one of the most popular features of Outlook. In this article, we will guide you through the use of the Calendars various functions. In addition, we’ll introduce you to calendar improvements that are specifically targeted to make your experience more consistent.”