Revenue increased $2.8 billion or 23%.
Server products and cloud services revenue increased $2.7 billion or 26%, driven by Azure. Azure revenue grew 50%, due to growth in our consumption-based services. Server products revenue increased 3%, driven by hybrid and premium solutions, on a strong prior year comparable that benefited from demand related to Windows Server 2008 end of support.
Enterprise Services revenue increased $170 million or 10%, driven by growth in Premier Support Services.
Operating income increased $1.9 billion or 41%.
Gross margin increased $2.3 billion or 27%, driven by growth in Azure and the change in estimated useful lives of our server and network equipment. Gross margin percentage increased with the change in estimated useful lives of our server and network equipment. Excluding this impact, gross margin percentage increased slightly, driven by gross margin percentage improvement in Azure, offset in part by sales mix shift to Azure.
Operating expenses increased $460 million or 12%, driven by investments in Azure.