Although Apple has incrementally improved business and enterprise functions with every iOS release, three releases were particularly significant for business users and the IT professionals that support them: iOS 2 (called iPhone OS 2 at the time), which introduced support for Exchange ActiveSync and configuration profiles; iOS 4, which introduced Apple’s mobile management and app encryption APIs and helped launch the MDM/EMM industry; and last year’s iOS 7, which ratcheted up enterprise security and management capabilities.

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