Bob Muglia is no longer just Senior Vice President of the Microsoft Server and Tools Business. As of January 5, 2009, he has been promoted to the role of President of the Server and Tools Business. In this manner, the head of Microsoft Server and Tools since the end of October 2005 is joining the two others Microsoft Presidents, namely Robert J. Bach, President of Entertainment & Devices Division, and Stephen Elop, President of Microsoft’s Business Division. In a letter to employees, Microsoft Chief Executive Officer Steve Ballmer revealed that Muglia was a combination of “talent, drive, vision, customer focus, and leadership.”

“As senior vice president of STB, Bob has established Microsoft as the industry leader in providing great server products to companies of all sizes and in delivering the tools that enable developers and IT pros to build optimized solutions for their customers and companies,” Ballmer revealed.

“In the process, he has helped build a remarkably successful business that has grown from virtually nothing a decade ago to more than $13 billion in FY08. Today, STB accounts for more than 20 percent of the company’s total revenue.”

Muglia joined Microsoft in January 1988, according to his official bio page. Over the past 21 years, he took on a variety of roles with the software giant, working on the MSN network, but also on Office, Windows Server applications, Visual Studio, and the Win32 API. Back in 2005, he replaced Eric Rudder as the Senior Vice President of the company’s Server and Tools Business.

“Bob joined Microsoft 21 years ago, in January of 1988. I can think of no better way to acknowledge the importance of his contribution over the last two decades than to extend my congratulations to him for his new title. As always, I look forward to continuing to work closely with Bob to drive further growth for STB and the entire company,” Ballmer added.