Let's see what Longhorn virtualization has to offe (Score 2, Insightful)

We currently have multiple ESX 2.5 machines for our production VMs, and are testing ESX 3.0 on our development box. We also have a couple of Virtual Server 2005 R2 boxes. Right now I can tell you that in an enterprise environment, ESX wins against VS 2005 hands down. Virtual Server 2005 is NOT an enterprise level virtualization environment. However, there are some major changes coming with Longhorn's virtualization, which isn't so far in the future now. A lot of goodies are on the way, and a lot of it is baked right into the OS. Microsoft is making a MAJOR push into virtualization. Don't count them out, especially if you're a Microsoft shop. If your just getting into virtualization, my recommendation is to set up a box for each of the freebies and try them out. If nothing else, knowing both will look good on your resume.