Sure - I should have prefaced that with some.<p>I've seen a couple of Hyper-V installations, but I'm pretty sure I haven't seen one running linux clients (despite the code MS put into the kernel).  I'm sure they exist - but for now Hyper-V is just a pure-MS play (and still behind VMWare at that).<p>Don't forget - MS really take a few iterations before their products begin to shine.  The X360 (barring H/W issues) is a really nice piece of kit, Office took a few versions but by 5/6 was really pretty good.  Windows 3.1 was when Windows started to work (although really you could declare that at a major release later 95).  And XP SP2 And Vista SP2 (aka Win7) were when the OS really started to shine.  Bottom line - Don't count MS out when they really put their mind to something.