It's been deprecated. You can pretty much do the same thing w/ another vertical tracing utility, such as the
also-now-deprecated Microsoft Network Monitor 3.4, or its replacement Microsoft Message Analyzer 1.2. Information about the former can be found in KB933741, "Information about Network Monitor 3", while support for the latter is found beginning @ the "Microsoft Message Analyzer Operating Guide" page; there's a wealth of information also to be found @ the Message Analyzer blog, the Technology Tutorials, and the Message Analyzer Wiki hosted on TechNet, the Message Analyzer Forum on Social TechNet, and in the instructive Videos Project Coordinator Paul E. Long has posted to YouTube.