We may think it doesn't matter to the sorts of customers we both serve, but Linux (with MySQL) is making a stealthy entry into many corporates (depending where you look, as much as 50% penetration by the end of this year) in the form of VOIP boxes.

Call me an MS-loyalist, but the functionality just isn't there for many corporations. That may change - and certainly those types of environments have opened up MS' eyes - but I know people who have looked at products like MySQL and just find it lacking. Maybe some day that might change...but I remember MySQL's offering in 2003 and have a decent idea of what it offers now, and I don't think it's evolved as aggressively as the promise.