Overview for Windows 10 release information, which explains build numbers and versions:

Microsoft has updated its servicing model. The Semi-Annual Channel is a twice-per-year feature update release targeting around March and September, with 18-month servicing timelines for each release. The Semi-Annual Channel replaces the Current Branch (CB) and Current Branch for Business (CBB) concepts starting with Windows 10, version 1703, which released for broad deployment on July 27, 2017. Windows Update for Business deferral policies based on broad deployment readiness should be calculated from that date.

Please note! The Windows 10 creators update (build 1703) includes the .NET version 4.7. This is not yet official supported for Microsoft Dynamics 365 Outlook Client. Check your .NET version on Windows: How to: Determine Which .NET Framework versions are installed

Check Windows 10 release information from Microsoft TechNet: https://technet.microsoft.com/en-us/windows/release-info.aspx

Additional information about compatibility for Dynamics 365 Outlook Client 8.x, you will find it here: Compatibility with Microsoft Dynamics CRM 2016 / Dynamics 365