9. Microsoft's Hyper-V is giving VMware fits
VMware has long owned the server virtualization market, but Microsoft's Hyper-V is a true contender, especially at the low end. The latest version, Hyper-V 2012, narrows the gap with vSphere, finally becoming "good enough" for companies to rely on, especially given its significant price advantage.
The emergence of System Center 2012, which includes virtualization management, has been particularly important. While few companies are ripping and replacing VMware in favor of Hyper-V, IDC says Hyper-V's market share is 27.6 percent of new servers going into service, up from 20.3 percent in 2008. Buyers in South America and Asia, as well as small businesses in developed markets, are increasingly turning toward Hyper-V instead of vSphere.