He makes a comparison to the open source world of linux, the same one that it's near impossible to find good drivers for your hard ware for, the same one that probably makes up less than 5% of OS world wide.
I have never had any problems finding Linux drivers for quite a variety of hardware, although sometimes you have to look for them its nothing major. I think the mistake many people make (including yourself) is considering GNU Linux as a desktop OS - it can be but its real selling point is in server use.... I don't have any figures to hand (I am not sure whether there are any reliable ones available or not) but I would guess that GNU Linux has easily less than 5% of the desktop OS market, but probably has one of (if not the) largest market share of server OSes - certainly more than windows. By servers I mean internet infrastructure servers (web, email etc), HPC servers etc... basically machine which are always on and need high levels of reliability and security.
I think MS would love to grow more in the server market, certainly they have worked with Linux companies in the past and they have started to open source a few items (in addition to them using GNU software), so things are changing to a degree.
Windows will be viable for an extremely long time, and Google's OS doesn't pose any threat to them.
Agreed, but the question is HOW viable - for a company like Microsoft they are desparate to hold and grow in their share, even if Google OS were to capture 1% of the desktop OS market - it is still a huge monetary loss for MS. Google have already beaten them in the search engine market - the worry for them I would guess would be that the browser contains the majority of the machine's support for running programs (such as Google's webbased codes) making the underlying OS somewhat redundant