The New York Times reported that Microsoft Windows head Steven Sinofsky has left the Redmond-based company after a “mutual decision by Mr. Sinofsky and Steven A. Ballmer.” Julie Larson-Green will take over Sinofsky’s position.

Microsoft described the departure of Mr. Sinfosky, a 23-year veteran of the company, as a mutual decision by Mr. Sinofsky and Steven A. Ballmer, the chief executive of the company. Julie Larson-Green, another Microsoft veteran in its Windows division, will take over the leadership of all engineering responsibilities related to Windows. Tami Reller, the chief financial officer of the Windows division, will run business and marketing for the group.

This is a similar situation to Scott Forstall leaving Apple earlier this month. Sinofsky joined Microsoft in 1989, where he rose to become head of the Windows division in July 2009. Much like Forstall, he was an integral part in the development of Microsoft’s core products. The Microsoft veteran gave the following statement:

“It is impossible to count the blessings I have received over my years at Microsoft. I am humbled by the professionalism and generosity of everyone I have had the good fortune to work with at this awesome company.”

Ballmer added:

“I am grateful for the many years of work that Steven has contributed to the company. The products and services we have delivered to the market in the past few months mark the launch of a new era at Microsoft. We’ve built an incredible foundation with new releases of Microsoft Office, Windows 8, Windows Phone 8, Microsoft Surface, Windows Server 2012 and ‘Halo 4,’ and great integration of services such as Bing, Skype and Xbox across all our products. To continue this success it is imperative that we continue to drive alignment across all Microsoft teams, and have more integrated and rapid development cycles for our offerings.”

WinSuperSite obtained Synopsky’s letter:

Some might notice a bit of chatter speculating about this decision or timing. I can assure you that none could be true as this was a personal and private choice that in no way reflects any speculation or theories one might read-about me, opportunity, the company or its leadership.

The Verge obtained Ballmer’s letter to the Microsoft team:

Over the past few months we have delivered the foundation for a new era for Microsoft. From Office to Bing to Windows Phone and Windows Azure, to Xbox and of course Windows and Surface and everything in between, we’ve unleashed a huge wave of devices and services that people and businesses love. I simply couldn’t be more proud of the effort you have all put in to get us here and to set the foundation for our future. At the Windows launch in New York, at the Windows Phone event in San Francisco, and again at the Build event on Redmond campus, I was struck that while externally many people look at these events as the finish line, they really represent the starting line of a new era.

As we enter this new era, and with the successful launch of Windows 8 and Surface behind us, Steven Sinofsky has decided to leave the company. Steven joined Microsoft in 1989 as a software development engineer and has contributed to the company in many ways from his work as a technical advisor to Bill Gates, to leading the evolution of the Microsoft Office business, to his direction and successful leadership of Windows and Windows Live as well as Surface. I am grateful for the work that Steven has delivered in his time at our company. Effective immediately, Julie Larson-Green will lead Windows engineering. She will be responsible for all product development for Windows and Windows Live, in addition to Surface. Julie has been a stalwart leader of building compelling “experiences” from her time on Internet Explorer, through the evolution of Office and most recently to the re-imagination of Windows. Her unique product and innovation perspective and proven ability to effectively collaborate and drive a cross company agenda will serve us well as she takes on this new leadership role. All of the current Windows engineering teams will report into Julie, and Julie will report to me.

Tami Reller will lead business and marketing strategy for Windows including Surface and partner devices. She will provide broad stewardship to our PC marketing efforts while managing the line business functions for Windows. Her work on Windows since 2007 has been exemplary and her strong talents in working with internal groups and partners will also serve us well. Tami also will report to me.

We are facing a time of great opportunity. What we have accomplished over the past few years is nothing short of amazing, and I know we have more amazing in us. I am excited about our people, I am energized by our ability to change and grow, and I look forward to the success which lies ahead. Thank you for all you do, and please join me in congratulating our new leadership and celebrating all that we have accomplished so far.

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