Windows 10, version 1703 Enterprise and Education editions will reach end of life on October 9, 2019. Microsoft also urges Windows 10 Creators Update users to update their devices to latest version of Windows as soon as possible. The Home, Pro, Pro for Workstations, and IoT Core editions of Windows 10 v1703 reached end of service last year, on October 8, 2018. There are eight compatibility holds active for Windows 10 version 1903 the latest stable version but Microsoft provides mitigation measures for some of them.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-warns-of-windows-10-1703-end-of-life-for-enterprise/