In February 2010, well before Steve Ballmer declared Microsoft to be a devices and services company, the commercial version of Windows Azure made its debut. The newly minted cloud platform was tucked tightly into Windows Server, which owned, and still does, a commanding share of the server operating systems market.Whatever the strengths or weaknesses of Azure turned out to be, surely integration with Windows Server would guarantee it some measure of success.But nearly four years later, in a time when Windows operating systems have lost some of their mojo, and where Microsoft faces multi-billion dollar, cloud-focused competitors such as Amazon and Google neither of which aspires to own a server operating system the pressure of...