Exchange Server 2007 Web Services is an exciting, new, platform-agnostic API for talking to Exchange 2007. In this chapter, we covered some basics of Web services and how to build the autogenerated proxy classes that you use when talking to Exchange Web Services. We also discussed some of the "gotchas" that you might encounter when using the proxy classes due to the differences between XSD and C# classes. We finished the chapter by showing you how to make raw SOAP+XML calls using HttpWebRequest. In the next chapter, we will begin discussions on how to identify mailboxes and the items contained therein.