Microsoft has acquired PhoneFactor, a leader in multifactor authentication (MFA) solutions.

"The acquisition of PhoneFactor will help Microsoft bring effective and easy-to-use multifactor authentication to our cloud services and on-premises applications," said Bharat Shah, corporate vice president, Server and Tools Division for Microsoft. "In addition, PhoneFactor's solutions will help Microsoft customers, partners and developers enhance the security of almost any authentication scenario."

Founded in 2001, PhoneFactor helps secure millions of logins and transactions each year. By leveraging a device nearly every user already has - a phone - PhoneFactor enables deployment of MFA across a wide range of applications. It already works with many Microsoft products and services, including Outlook Web Access and Internet Information Services, and interoperates with Active Directory.

Terms of the deal were not disclosed.