Three years ago, the U.S. Marshals Service's IT infrastructure was a neglected mix of outdated PCs and software, redundant servers and applications, and lax security. The Marshals Service has turned that around with an IT modernization that put the latest generation of tech tools--Windows 7 PCs and laptops, collaboration apps, and VoIP--in the hands of its officers. Under CIO Lisa Davis, the agency has consolidated servers, established a central case-management database, and tightened IT security. It also undertook a pilot program to learn how iPhones and other mobile devices could be used by its on-the-go workforce.