Following the continuing popularity of the 360 controller, Microsoft released the official drivers for Windows 7 and 8 on the 5th of June 2014.
In November 2014 exactly one year after the Xbox One became available, Microsoft scheduled the release of the Xbox One Controller + Cable for Windows, which is a re-branding and re-purposing of the Xbox One controller and thus it can be used with either the console or PC.
Microsoft came up with wireless dongle for the Xbox One controller in October 2015 and it was initially sold as Windows 10 only. At the time there was no mention about supporting previous versions of Windows but couple months later in December they launched Windows 7 and Windows 8.1 support for the dongle.
The support of Xbox One controller's impulse triggers with PC ports is uncertain.
Shorter D-Pad, removed screw holes, screw-less design, glowing X, "over 40 improvements" total according to Microsoft
Higher price, redundant features