Rodrigo Costa, the Microsoft vice president who has headed the company's lucrative OEM sales unit for the past three years, has decided to make a move -- literally, in Costa's case. He is returning to Portugal to "pursue opportunities outside of Microsoft." Stepping into Costa's role is Scott Di Valerio, who is currently corporate vice president of finance and administration and chief accounting officer. Microsoft is seeking someone to take over Di Valerio's finance duties. Until then, Di Valerio will continue to serve in his current position, while taking the OEM reins.