Office system and Windows Vista, increased revenue associated with SQL Server, Windows Server, and Visual Studio, and increased Xbox 360 console sales. Foreign currency exchange rates did not have a significant impact on consolidated revenue during the year. 

Operating income growth was driven primarily by the increased revenue and decreased costs for legal settlements and legal contingencies, partially offset by increased cost of revenue associated with Xbox 360 and Windows Vista, increased OSB data centers costs, and increased sales and marketing expenses. In July 2007, we expanded our global Xbox 360 warranty coverage to three years from the date of purchase for a general hardware failure indicated by three flashing red lights. As a result, we recorded a $1.06 billion charge for anticipated costs under the warranty policy, inventory write-downs, and product returns. The increase in sales and marketing expenses was primarily driven by increased headcount-related costs and marketing costs related to recent product launches. Headcount-related costs increased 15%, driven by a 10% increase in headcount over the past twelve months and an increase in salaries and benefits for existing headcount. 

 

Fiscal year 2006 compared to fiscal year 2005 

 

Revenue growth was driven primarily by growth in SQL Server following the launch of SQL Server 2005 in the second quarter of fiscal year 2006, Windows Server and other server applications, increased Xbox revenue resulting from the Xbox 360 launch in November 2005, growth in licensing of Windows PC operating systems through OEMs, and increased licensing of Office and other MBD software. Foreign currency exchange rates did not have a significant impact on consolidated or operating segment revenue during the fiscal year. 

Operating income increased primarily reflecting the revenue increase and a decrease in costs for legal settlements and legal contingencies. These changes were partially offset by an increase in cost of revenue primarily related to Xbox 360 and an increase in sales and marketing expenses primarily as a result of increased investments in partner marketing and product launch-related spending. Headcount-related costs increased 7%, driven by an increase in salaries and benefits for existing headcount and a 16% growth in headcount. 

 

Fiscal Year 2008 Outlook 

 

Worldwide macroeconomic factors have a strong correlation to business and consumer demand for our software, services, games, and Internet service offerings. We expect a broad continuation in the economic conditions and demand in fiscal year 2008. We also expect continued double digit revenue growth. Given our product launches in the second half of fiscal year 2007, we expect revenue growth to be higher in the first half of fiscal year 2008 than in the second half. We estimate worldwide PC shipments will grow between 9% and 11%. We do not expect a significant impact from changes in year-over-year foreign currency exchange rates in fiscal year 2008. We expect our operating income growth rate to exceed our revenue growth rate. 

 

SEGMENT PRODUCT REVENUE/OPERATING INCOME (LOSS) 

 

In July 2006, we announced a change in our