Microsoft Simplifies the PC With Windows 7: New PC operating system available worldwide today.NEW YORK — Oct. 22, 2009 — Today Microsoft Corp. announced the worldwide availability of its new Windows 7 operating system. Windows 7 delivers on a simple premise: make it easier for people to do the things they want on a PC. The new operating system offers a streamlined user interface and significant new features that make everyday tasks easier and allow people to get the most out of computers of all styles and sizes.