Microsoft even added into the Office 365 Admin Center, the ability to create a bootable ISO image which lead many to believe that this was more than an upgrade option. Due to the ambiguous nature of the name and the originally poor communication Microsoft released relating to this SKU, many individuals believed that this was a full license of Windows 10 Enterprise. The license can be used on up to 5 machines per user and is strictly for performing upgrades.
This subscription allowed users to connect their workstations to Azure AD and upgrade a valid Windows 10 Pro license to Windows 10 Enterprise. Around a year ago, Microsoft released a new subscription called Windows 10 Enterprise E3.
