Abstract
The chapter explores MSN messenger, and describes the architecture, protocol, and features of MSN messenger. The architecture of MSN Messenger is very complicated as compared to other instant messaging services, such as AOL Instant Messenger (AIM) and Yahoo! because it relies on five different types of servers to handle the communication and operation of its service. MSN Messenger has standard features that are common in other instant messengers, with some functionality and features that exist as links to MSN websites, making it somewhat a promotional tool to drive traffic to Microsoft's websites. There are several unique features in MSN Messenger that include whiteboard, remote assistance, and application sharing. The chapter describes several types of security issues concerning MSN Messenger. The security issues that involve worms, Trojans, or other malicious programs which spread via MSN's instant messaging service are discussed in the chapter.
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