Here's a little tidbit. If you type a domain name into your browser, you might find that no website appears. This does not mean that the domain is available, though. A lot of companies buy domain names for future use or for strategic value (for example, to prevent their customers from taking those domain names.)
So can you buy that domain name from the owner? Maybe, or maybe not. The reality is that if it's owned by a company, then they probably bought it for strategic purposes -- perhaps for some future product. They are unlikely to relinquish this domain, and frankly, it'd be foolish to assume that they have no use for the domain in question.