Windows Division revenue decreased primarily due to the prior year launch of Windows 7, including recognition of approximately $1.7 billion of revenue in the prior year related to the Windows 7 Deferral. OEM revenue decreased $1.8 billion or 32%. This decrease was driven by the prior year launch of Windows 7, reflecting a decrease in inventory in our distribution channels, and lower Windows attach rates in China, partially offset by PC market growth. Other revenue decreased $314 million or 20%, driven primarily by the prior year launch of Windows 7. Considering the impact of the Windows 7 launch in the prior year, we estimate Windows Division revenue growth was in line with PC market growth. We estimate total worldwide PC shipments from all sources grew approximately 2% to 4%.
Windows Division operating income decreased primarily as a result of decreased revenue. In addition, sales and marketing expenses increased $22 million or 3% reflecting increased advertising of Windows and Windows Live.