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this is the public launch of the 2008 product line. MSDN is more private.

I think you can compare the hashes of the kernels and find them to be the same. It's more a matter of what sits around the kernel that might give you a difference in perceived and real performance.

Actually Vista SP1 and WS 2008 have the same kernel.

Edited 2008-02-27 06:31 UTC

So the Vista kernel has no built-in limits in the amount of adressable phisical memory, for example? Or is that not part of the kernel now?
It looks http://www.microsoft.com/windowsserver2008/en/us/compare-specs.aspx like not even Server editions share the same code. Maybe it is a registry key? /HKEY_MACHINE/SECRET_KEY/Use_2TB_RAM
Windows Server 2003 really was a perceived and a real improvement over XP and my bet is that Server 2008 in its various flavors is too a real improvement over Vista, even when you use it for non-server applications.

Edited 2008-02-27 08:50 UTC

http://www.microsoft.com/windowsserver2008/en/us/pricing.aspx
The cheapest one 999$ in the US.

No, the cheapest version is the Web Server edition, $469 (from your link).

Btw, the IIS7 comes with built-in support for FastCGI that can run PHP. It works in Server Core installation, too. Obviously it aims to compete with the LAMP.

Oops, but where's the catch? Vista Ultimate pricing with the most bloat you get being a Web-server, and purportedly 100% Vista compatible?
Sounds like the Windows I'll be getting for the next PC I build if Win6 isn't obsolete by then.

I realize its sarcasm and you did add the [/troll] tag but some people will actually think thats true. I wish those people would realize there is more to the network than just servers themselves. Take into account routers, load balancers, and the ISP.