I currently just have a Windows XP Pro box with Virtual Server 2005 R2 installed for my software testring. It has about 20 virtual machines on it. Mostly consumer operating systems (XP, Vista, 7) used for software testing, although once in a while, there is a need for a Server OS (2003 or 2008) virtual machine.

Does anyone run Hyper-V server, because I would be interested to hear any prons and cons to it.

It looks like at least one pro would be its ability to run x64 guest operating systems, which Virtual Server does not (only x86)

Is there anything else I would look to gain by moving over? I was looking for a break down comparison of the two, but most of what I find is just comparing VMWare to MS offerings.

I also like Virtual Server because it will run older operating systems like Win2000 and Win98 (even though they arent technically supported) which I still need to support my .NET 2.0 applications.