how to change Windows NTP Server to OVH NTP (for example, for OVH Public Cloud servers)

OVH lacks of documentation, especially for windows, and when you find something, it's too old. So here it is... how to change Windows NTP Server to OVH NTP...

Open POWERSHELL, check current state:
w32tm /query /peers

Set the NTP Server to OVH one:
w32tm /config /syncfromflags:manual /manualpeerlist:"ntp0.ovh.net"

Restart the w32time Service:
restart-service w32time (instead of stop-service w32time ; start-service w32time)

Check current state again:
w32tm /query /peers

If it says "State: Active" then everything went fine!

Done!