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Craig James Johnston is the author of many articles for PDA Essentials magazine and for the enormously popular BlackBerry site CrackBerry.com, which reaches 675,000 registered members and has 36,000,000+ page views per month. He also co-hosts CrackBerry.com's increasingly popular podcast. Johnston is author of Professional BlackBerry, a leading technical guide for BlackBerry administrators, and was the Technical Editor for Hacking BlackBerry. He is a BlackBerry Architect with more than nine years of experience in enterprise mobile computing and twenty years of experience with networking and messaging.