Microsoft Security Business Exceeds $10B in Revenue Microsoft's security division has grown more than 40% year-over-year, the company reports alongside security product updates. Microsoft today announced its security business surpassed $10 billion in revenue over the past 12 months, reflecting more than 40% growth year-over-year. Related Content: In recent years, Microsoft has tightened its focus on strengthening the security of its products and services, as well as rolling out its own security tools. More than 9,000 customers use Azure Sentinel, its cloud-based SIEM made available in September 2019, and 90 of the Fortune 100 use at least four of Microsoft's security, compliance, identity, and management tools, the company reported.