Microsoft’s Windows 10 will come out more frequently than the previous two-to-five year release cycle. How often Microsoft will release new branches and how long it will support old ones is still unclear. Windows 7 is currently scheduled to be supported until 2020. Large companies, with enterprise licenses of Windows 10, will get the most choice, can stay on older branches longer. Small and midsize companies running the “professional” version of Windows will have the least choice. But it’s unclear how much of a pent-up demand there is for a single operating system to rule them all.”]