Software features that are no longer supported become obsolete and are then removed. The software itself is generally described by its state. An outdated version of Windows will stop receiving software updates from Windows Update. These updates include security updates that can help protect your computer from malicious viruses, spyware, and other malicious software that can steal your personal information.
Windows Update also installs the latest software updates to improve the reliability of Windows, such as new drivers for hardware. Outdated software refers to systems that are no longer up-to-date, patched, or that are generally not taken care of by the software developer. It expires when it is removed from the version and its use is no longer allowed, or when the software itself has bombarded itself, a function, an entity, or a part of itself for being useful. In the event that operating systems reach the end-of-life (EOL) state, software developers (the people who create the “applications you run”, such as web browsers or word processors) will also stop creating with support for that operating system, which means that applications such as Chrome, for example, they will eventually stop receiving updates on older platforms.
Of course, there are some exceptions to this rule, but they are rare and usually involve the need for specialized legacy software and equipment that runs without an Internet connection, usually in industrial circumstances. The open source community sometimes lists software as abandoned, meaning that there is no one left to maintain it. It's simply not possible to use a finite amount of resources to manage the ever-increasing versions of software. Abandonware is a product, usually software, ignored by its owner and manufacturer, and for which there is no support available.
Nowadays, malware is sent through your web browser regularly and security updates through patches, fixes and new versions keep you aware of these threats. When this software is no longer compatible, if you continue to use it, you put yourself at risk. Paying software engineers and technical support specialists to maintain one or two versions of a product is one thing. When software (here we use the term interchangeably to refer to applications and operating systems) is “out of support”, that means that the vulnerabilities constantly encountered by researchers and nefarious people are no longer being corrected.
The process of putting a piece of software in the trash is known as “End of Life” or EOL and basically it means that the creator will no longer release updates or release patches for that program. On an older device, old software might work well long after the developers have moved on and forgotten about it. For example, if you're using an iPhone 6 or an older model, Apple no longer updates the software used on the phone and the user may experience problems. Using old software which no longer receives the love and attention it needs from a development team can cause serious problems that users should be aware of. The term 'obsolete' does not accurately describe this situation as it implies a need or use for the software which may not be present; the software can become virtually obsolete long before its planned support date.
