<DIV><DIV>For many organizations email is the business-critical communications technology. Organizations which use Microsoft server technologies frequently use Microsoft Exchange as an email server. Exchange 2007 is a major revision. There are significant changes in the GUI tools and a new command line interface that uses Windows PowerShell to provide command line administration to parallel and complement the GUI tools. Exchange administrators will have to adapt to a substantially different interface (the Exchange Management Console) and an entirely new command line tool - Windows PowerShell. Exchange Server 2007 Administration: The Definitive Guide aims to provide comprehensive coverage of topics relevant to Exchange 2007 administrators including planning, installing, managing, and troubleshooting a Microsoft Exchange Server 2007 installation.</DIV>