This work covers all the updated features of Exchange Server as well as all the complexity introduced by Windows 2000 Active Directory integration, Exchange's conferencing services and instant messaging, as well as new security features, permissions and routing procedures.
Instant messaging and e-mail make our jobs much easier. Long gone are the days of running to your colleague's desk to have normal, face-to-face human interaction about your project. Now, we can send each other passive-aggressive messages and avoid each other altogether. Yay.