Gates and Ellison are their own worst enemies. If I were Gates, I'd have a "Windows" version of Linux developed that matched or exceeded the "DOS" OS, as well as a plethora of compatible applications.
There are many hamburger joints, only one McDonalds. They didn't get to be global by holding up the customer to by a Big Mack.
Haven't you noticed how many Unix tools and concepts Microsoft has already ripped off from the open source community and incorporated into their systems?
They first lifted the Xerox/Apple desktop as their external interface, and then after destroying 3rd party commercial vendors of niche products by incorporating their features into Windows, turned to open source utilities and functionality and made them an integral part of their fee products.
Can you spell P-A-R-A-S-I-T-E?