I just want to quickly clarify the editorial I wrote yesterday. Other bloggers have written that I suggested that Citrix XenServer is going away. This is not what I believe. I firmly believe that Citrix XenServer is here to stay, and that it was a very good thing for Citrix to buy XenSource.
My prediction, specifically, was that XenServer will evolve to work on Microsoft's Hyper-V hypervisor and that Citrix will ultimately drop support for Xen (or at least lessen the focus on Xen). But I want to be 100% clear on this: When I say that Citrix will drop Xen, I mean that Citrix will drop the open source Xen hypervisor. I do not believe that Citrix will drop their XenServer product.
In other words, all the value that XenServer adds to the Xen hypervisor will still be there. XenServer will still be there. It's just that XenServer will run on Hyper-V, and the value that Citrix brings to the table will be value that's brought to Hyper-V.
NOTE: Before you comment, read the main blog entry from yesterday that this is about. That has the full details of what this is about.