Bach is said to be retiring; Allard, who has been on sabbatical recently, is simply moving on, though he’ll remain an adviser to the company.

Interestingly, Microsoft (MSFT) isn’t replacing Bach. Instead, the company is splitting his responsibilities between Senior VPs Andy Lees and Don Mattrick, who will oversee the company’s gaming and mobile businesses, respectively. Mattrick and Lees will report directly to CEO Steve Ballmer, who is evidently taking on more of a role in Microsoft’s consumer devices efforts, which, with the exception of the Xbox 360, have stumbled in recent years.

News of the shake-up was first reported by The Wall Street Journal.

The full text of Microsoft CEO Steve Ballmer’s memo announcing the moves below; further details to follow:

From: Steve Ballmer
To: Microsoft – All Employees
Subject: Executive Leadership Transitions

After almost 22 years with the company, Robbie Bach has decided to retire from Microsoft. I have worked with Robbie during his entire tenure at Microsoft, and count him as both a friend and a great business partner and leader. Robbie has always had great timing, and is going out on a high note–this has been a phenomenal year for E&D overall, and with the coming launches of both Windows Phone 7 and “Project Natal,” the rest of the year looks stupendous as well. While we are announcing Robbie’s retirement today, he will remain here through the fall, ensuring we have a smooth transition.

Concurrent with Robbie’s retirement, I am making several organization changes to ensure we have the right leaders in the right positions as we set ourselves up for the next big wave of products and services. Effective July 1, Don Mattrick, who leads our interactive entertainment business, and Andy Lees, who leads our mobile communications business, will report directly to me. Don and Andy have built out strong leadership teams and product pipelines, and are well-positioned for the years ahead.

Independent of Robbie’s decision, J Allard (currently serving as senior vice president of Design and Development for E&D), will also be leaving Microsoft. Given his ongoing passion and commitment to Microsoft, he will remain as an advisor to me, helping incubation efforts, looking at design and UI, and providing a cross-company perspective on these and similar topics. With J’s change in role, corporate vice president David Treadwell will join IEB to lead the core technology organization, reporting to Don. David has a great set of accomplishments at Microsoft, most recently working on the Windows Live Platform Services team. Over the next several months, Robbie and I will work together to finalize reporting and structure for the rest of his org.

Now that Office 2010 has been launched to business customers, Antoine Leblond, senior vice president in the Office Productivity Applications Group, will take a new role as senior vice president for the Windows Web Services team. This team brings together the integral Windows services that today deliver updates, solutions, community and depth information for the Windows consumer. Kurt DelBene, senior vice president in the Office Business Productivity Group, will take on all of the engineering responsibilities for the Office business.

Transitions are always hard. Robbie has been an instrumental part of so many key moments in Microsoft history–from the evolution of Office to the decision to create the first Xbox to pushing the company hard in entertainment overall. J as well has had a great impact in the market and on our culture, providing leadership in design, and in creating a passionate and involved Xbox community, and earlier being at the center of our work seizing the importance of the Web for the company. But most important, both have been great team builders with a strong record of attracting, coaching and growing talent. As a result, their teams are primed to continue to step up and deliver great products, great services and great results for the company. Don has led the Interactive Entertainment Business since July 2007, where he’s significantly grown our entertainment footprint as well as our profitability. He can count as successes the evolution of Xbox Live, the launch of blockbusters like “Halo 3” and the much-anticipated “Project Natal.” Previously, Don was president of Electronic Arts Worldwide Studios. Andy has led the Mobile Communications Business since February, 2008, and has been instrumental in reinvigorating our mobility efforts, bringing in new business and development talent and overseeing the creation of both KIN and Windows Phone 7.

As we finalize and ship so many of our key products (“Project Natal,” Windows Phone 7, Office 2010, Windows Live Wave 4 and others) it is a natural time for us to look ahead and make sure we have the right talent in the right roles to fuel our next set of offerings. I am confident that the changes above will set us up well for the months and years ahead.

I want to close by thanking Robbie for the incalculable contributions he has made to Microsoft over the years. He will be greatly missed when he retires this fall, and I am glad that I’ll have the opportunity to continue working closely with him between now and then. And as J makes a similar transition, I look forward to working with him in a new way.

Steve

Actually, it seems quite systematic. “It’s part of the global cost-cutting move,” one Oracle (ORCL) employee tells The Times of India, which notes that 40 workers were just let go at the company’s Bangalore offices. “This is just the initial move and the numbers will definitely increase. By next week, we should get the actual figures.”

Now, word on the street has it that the figure in question here is somewhere around 8,000. But there’s no mention of Oracle in the latest EDD Worker Adjustment and Retraining Notification list, which would seem to suggest that 8,000 figure is bogus. And according to our sources it is. We’re told that layoffs are occurring, but that their number is in the hundreds, not thousands.