Well I was looking around, and I couldn't find anything like this at no cost for Debian or anything else other than a Microsoft server. I was thinking of a solution in the form of a plugin to do just that, manage the updates that you need for X or Y version of Windows. So if you have multiple computers at home, your OMV server would redistribute these updates. That means downloading the updates just once, rather than twice. Or three times. Or in my case, six times. And this can be useful too for people with restricted bandwidth or your average IT guy fixing computers at home for his friends and family (that's me as well :lol:).
Anyone knows of something like WSUS that can be used in Debian? That would be a VERY nice use for a home NAS to be honest, and perhaps encourage anyone that can do plugins make a nice package for OMV.