In an announcement late Monday night, the software maker said it has hired Michael Sievert as corporate vice president for Windows product management. Sievert replaces Tom Button, who the company said has been on a leave of absence for "family medical reasons." The company said it expects Button to return to the company in a new role.
Sievert had been AT&T Wireless' executive vice president and chief marketing officer. Prior to that he was executive vice president and chief global marketing and sales officer and also had posts at IBM and Procter & Gamble.
One of Sievert's major responsibilities will be preparing for the, the next major release of Windows, which Microsoft reiterated on Monday is still slated for launch next year. Microsoft has by midyear a beta, or test version, of Longhorn.