"In 2005, hot new startup XenSource was positioning itself as
the open source alternative to VMware and Microsoft Virtual
"Then came a controversial pact in 2006 between the powers that
be at the Palo Alto virtualization software company and Microsoft.
The mail goal, XenSource executives argued, was to ensure
interoperability between the two platforms going forward and ensure
that Linux virtual machines ran well on Microsoft's forthcoming
'Viridian' hypervsior, now known as Hyper-V..."