Free Software Magazine: Xen, The Virtual Machine Monitor

“Virtualization is set to become a key requirement for every
server in the data center. This trend is a direct consequence of an
industry-wide focus on the need to reduce the Total Cost of
Operation (TCO) of enterprise computing infrastructure. In spite of
the widespread adoption of relatively cheap, industry standard
x86-based servers, enterprises have seen costs and complexity
escalate rapidly.

“Today, for every dollar spent on computing hardware, as many as
five dollars are spent on lifetime costs–support, maintenance, and
software licenses…”

Complete Story