Server virtualization feels unstoppable these days. The worldwide market for virtualization platform software grew 69% last year to US$1.1 billion, according to market research firm IDC, which predicts average annual growth of 27% through 2011, when global sales are expected to total $3.5 billion. But several factors could still stall the technology's growth, analysts say. For instance, software licensing terms often remain too restrictive or expensive for users that want to run their databases or applications on virtualized servers. In addition, finding IT workers who have virtualization experience can be a challenge for companies. Read the full story at Webwereld.