I'm not sure what the argument is.... because none of us know anyone who will seriously switch to using Windows 8 metro on their business desktops, do we?
It's between Win7 versus trouble it takes to setup Win8 to boot into desktop, looking like Win7. Who here is arguing for Win8 metro on a work desktop? That's the part I don't understand, no one is puting up a counter-argument in favor of Win8 metro for work.
Microsoft themself aren't advising businesses to switch to Win8, they're still recommending people get themselves onto Win7 as soon as possible (sound advice, imo, if you're still on XP).
I can see business cases for Win8 over Win7. Most people only need a few pre-chosen programs on their computer. If they can just learn "press the windows key" then instead of the Start Menu which has everything, you can deploy a standard Start Screen that has, e.g. Email, Word and Browser, in large friendly icons. How simple is that? Or add a separate column containing all the locations necessary for work, e.g. the pages on our corporate intranet. Never again will you have to say: "now, go to favourites, it's in the top right, now go down and find where it says 'timesheets'", etc.
Also, Win8 has some nice stuff for corporate deployments. All that SkyDrive cloud stuff works just as well with your own private cloud on a Server 2012 install as it does with the free public stuff. It's surprisingly convenient to have your phone and your desktop and your laptop all magically in sync and just taking care of all that stuff, calendars, files, contacts. There's conditional installs, so a program is only "installed" whilst you are, e.g. connected to the corporate VPN or on-site. The Web Apps for Office 2013 are a lot more secure and manageable. And more and more people are basically bringing their own device to work and Win8 supports that better than any other OS at the moment in turns of controlling data, locking things down.
It's really nice, basically. But it will take some time before people really start to use these features.
