Seems like the Yankee Group has learned its lesson very quickly : it does no good to tout the MS line when it comes to reliability and security of Windows vs anything else.
Apparently, YG is reacting fast to the dreadful drop in credibility. Good for them, I wish them the best, but they are still part of the Tocquevilles of this world as far as I am concerned.
It's like having an STD - once you've got it, you've got it.

Same situation on the desktop, at least according to the results of the recent PWN2OWN contest, along with many years of my own experience running Ubuntu/Kubuntu, OpenSuse, and Mepis. These systems just run and run, with little problem from viruses, and updating programs and OS files typically does not require a reboot (except for occasional kernel updates). Most updates are really optional, due to the excellent security of *nix systems.
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So this lends a new viewpoint as to the COST of operating systems and software. 
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Microsoft and Windows software COSTS you to purchase it, COSTS you time and money to protect it with antivirus/ antispyware software that, even if free, COSTS you by loading and slowing down your machine, COSTS you by using more power than open-source solutions, and COSTS you your self respect by making you into a spoon-fed, remote-controlled, dependent "software-consumer" instead of being able to operate and control the computer you paid good money for. Apple is not much better in this regard, due to the whole Steve's- Koolaid-force-feeding thing.
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Linux and open source software have none of these limitations, and offer you an almost unlimited free library of applications and a huge selection of excellent free operating systems to run these applications on. You can set up your own very powerful home or business network server (Samba and/or NFS), set up a Linux multimedia center ala Mythbuntu, set up all users on the network to run user-friendly desktops like Kubuntu, and even dual-boot or VM windows to those users who do not want to kick the windows habit cold-turkey. 
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Sure, there is a small learning curve, but not much different than springing Vista or Office 2007 on some unsuspecting user. And the biggest difference - the learning curve for Open Source actually has benefits greater than just lining Bill Gates' wallet.

Let me get this straight: the "Yankee Group" [1] is selling a "2008 Server OS Reliability Survey" [2] and they even do not list hp OpenVMS? Are we suppose to learn from this "Yankee Group" report that vole poo-poo stinks worse than penguin guana?

A quick search through the "Yankee Group's" web site shows that these people even do not know OpenVMS. Tomorrow you are going to cite a report from CNN, or what?

[1] www.yankeegroup.com
[2] http://lxer.com/module/newswire/ext_link.php?rid=101796