[pwaring]

They were never a Xen shop, they trialled Xen with a few customers but never rolled it out. This blog post has more detailed info:

http://blog.bytemark.co.uk/2011/02/28/why-we-skipped-xen

[evangineer]

Funny, I did read that article a few months ago but had completely forgotten about it. It's a good read if you're into the virtualisation thing.