I finally got around to producing a Pololu Maestro driver for Windows IoT. A couple of VS Projects are attached that you can use for samples.
One think to keep in mind is to modify the Package.appxmanifest file for your IoT application. You'll need the USB VID/PIB for your particular device. For example, here the manifest element to use for a 12-channel Maestro.
<Device Id="vidpid:1FFB 008A">
Have fun !
Maestro.zip (126.6 KB)