Quest Authentication Services is patented technology that addresses the authentication needs of more than 1,000 enterprise customers with more than 5 million installed seats by extending the security and compliance of Active Directory to Unix, Linux and Mac, as well as to many enterprise applications. Some of the largest and most complex global environments rely on Authentication Services to achieve compliance with cross-platform access control, improve operational efficiency with centralized authentication and single sign-on, as well as unify identities and consolidate directories for simplified identity and access management.