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Get your mission-critical messaging and collaboration systems up and running with the essential guide to deploying and managing Exchange Server 2007. This comprehensive administrator's reference covers the full range of server and client deployments, unified communications, messaging security, performance optimization, troubleshooting, and disaster recovery. With special emphasis on security, the top concern for messaging administrators, this book includes chapters on messaging security, policy, and tools and techniques to mitigate e-mail viruses, spam, and phishing. This book delivers the definitive information-messaging that professionals need to deploy and operate effective, reliable, and more-secure messaging and collaboration services. The companion CD features a fully searchable eBook and job aids--everything you need to help build enterprise collaboration solutions that improve worker productivity, save time, and help reduce IT deployment and management costs.