In a well-publicized memo either earlier this year or sometime during last, (I can't remember exactly which, I admit), executives at Microsoft admitted they considered Linux and open source software to be the biggest threat to their dominance and continued expansion into a variety of markets, from the home desktop and business office to the emerging TabletPC and notebook market.After watching Microsoft closely for the last eighteen months or so, I've got to disagree. Microsoft's biggest threat isn't Linux, OpenOffice, or any piece of software at all--its themselves. Over the last eighteen months two distinctly different Microsoft cultures have emerged,...