Microsoft has expanded the Extended Security Update (ESU) program to allow businesses to get updates for Windows 7 after January 14. Anyone with Windows 7 Pro, Ultimate or Enterprise can purchase and activate a key that licenses you for security updates. You must purchase these extended updates starting at $61 the first year, the cost will increase over the next three years. The following patches must be installed before installing and activating ESU keys: Pupils must have several prerequisites as noted in the Windows IT Pro blog.”]