Microsoft Answers the question:
How do we get more than two OS sales per machine?
Think of all the money they'd lose if they designed their server software so that it was secure enough to run multiple tiers on one os image.
[... time passes ...]
Sorry for the grumpier than usual comment. The Windows security thing is getting to me. Both because of having to clean up friend's desktops and also doing many recent server installs where I have to make sure all this MS stuff that my clients are paying for is disabled.
Do these TCO studies include the cost of all the services you need to shut down to secure a Windows box that you'll never use?
Oh, and don't get me started about not backporting XP SP2 to W2K or their trial balloons about *selling* antivirus software or selective disclosure of vulnerabilities to volume licensees or ...