13 January 2015 is the date that Microsoft has decided on to officially cull mainstream support of Windows 7 SP1. Mainstream support is defined as patches and updates to provide new functionality or fix existing software and services inside the OS, so that means that there will not be a second service pack for the operating system. Although mainstream support is ending, critical security and software updates as well as updates for Windows Defender and patching of vulnerabilities will still take place. Windows 7 is officially End-of-Life for Microsoft, with the last batches of license keys being all sold out this year and OEM vendors now forced to Windows 8.1 for any new products that they will be shipping out this year.
Extended support for Windows 7 SP1 ends on 14 January 2015. Windows 8 mainstream support ends on 9 January 2018, with extended support stopping on 10 January 2023. It’s worth noting that not only is Windows 8 essentially replaced by 8.1, many companies are dropping support for it in support of Windows 8.1 Update. Man, Microsoft can’t make their desktop offerings simple, can they?
Source: Yahoo Finance