Microsoft to release Azure Stack as an appliance in mid-2017 Microsoft to release Azure Stack as an appliance in mid-2017 Microsoft to release Azure Stack as an appliance in mid-2017 Microsoft to release Azure Stack as an appliance in mid-2017 Azure Stack requiring users to buy a prequalified Azure Stack system Microsoft to release Azure Stack as an appliance in mid-2017 Microsoft to release Azure Stack as an appliance in mid-2017 ZDNet.com Microsoft to release Azure Stack as an appliance in mid-2017