Last time I checked Samba was on OSX and Solaris both of which are GPL are are as much stallmans as Linux... But if you would like to know where I would use solaris over Linux its where there is a cost break point.... Where would I use OSX, I do use OSX as one of my desktops, my wife uses it for her desktop and I just bought a mini for my Mother-in-Law. I have spent a good chunk of change on Sun in the past few year. Most if not all of the people you regularallily insult here are of the same mind and use the right tool technologically and economically..
So one tiny part of Solaris is GPL is your excuse for your choice of an O/S that is almost entirely GPL? LOL, that's no different than the argument we keep seeing that we should buy our computers straight from the Chicom government, simply because a few parts of most all PC's are made in China. Absurd, obviously.
http://www.freerepublic.com/focus/f-news/1606217/posts