This chapter has brought you up to speed on the storage architecture used in Exchange Server 2003. You learned, for example, that the Store.exe process can manage many databases on a single server and that databases are divided into stores, each of which can hold up to five databases, either private or public. You have also seen some of the new architecture for public folders, WebDAV, indexing, ExIFS, and front-end/back-end servers. The next chapter takes a look at the message routing architecture in Exchange Server 2003 and describes how messages are passed between servers.