In my experience, Ubuntu 12.04 is less stable than Windows 8. Ubuntu is more likely to freeze, crash, or otherwise act badly than Windows.
Last month, Bill Gates went to Omaha for the annual Berkshire Hathaway shareholders meeting. Bill gets to learn from Warren and gain insight into how he thinks.
This post will compare the newly Windows 2012 Hyper-V against VMware vSphere 5.1 in the following fields:
2.performance and scalability
Windows Server 2012 Hyper-V brings advanced virtualization features to small shops, but VMware still reigns at the high end
OpenStack is a collection of open source technologies that provides massively scalable cloud computing software. OpenStack can be used by corporations, service providers, VARS, SMBs, researchers, and global data centers looking to deploy large-scale cloud deployments for private or public clouds.