In 2001, Brian Valentine, then a top Microsoft executive, was pumped about Windows XP, as a spoof infomercial shows. By the time Vista was getting ready for release, his enthusiasm had waned. The reason? Some believe he was pining for Gianna Puerini, a sales manager who had left Microsoft for Amazon.com in 2003. In July 2006, Valentine secretly signed an employment contract with Amazon.com. Microsoft did not reveal that he was leaving for Amazon.com until September 5, less than a week before he started his new job. The business rationale for hiding his departure was obvious: Valentine ran the team that was shipping its Windows Vista operating system. Losing their leader would have killed morale.