Book excerpt: Microsoft Exchange Server provides a reliable messaging system that protects against spam and viruses and allows for access to e-mail, voicemail, and calendars from a variety devices and any location. Fully updated for the latest release of Microsoft Exchange Server 2007 Service Pack 1 (SP1), this book offers a look at the significant improvements and exciting features of SP1 and explains how they will increase productivity. You?ll walk through planning and design, installation, administration and management, maintenance, and more and also take a look at SP1?s interoperability with Windows Server 2008, unified messaging, and enhancements in mobile e-mail security and management.