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Microsoft Eva (Cortana) is the voice used for the widely used Cortana available on Windows 10 created primarily to rival other assistants such as Siri, Google Assistant, Amazon Alexa, etc. She is one of the two voices unlockable in Windows 10, the other being Microsoft Mark, that can only be unlocked by modifying the registry on a typical Windows 10 installation. More info can be found in the voice subpage.