Microsoft rolled out Windows 10 version 1507 back on July 29, 2015. Since then, the company has pushed out numerous major updates to the operating system including the November Update (version 1511), the Anniversary Update (version 1607), and the Creators Update (version 1703).

Support for the original version of Windows 10 was supposed to end in March 2017, but Microsoft pushed it back to May 2017. Today marks the last day of support for this version of Windows 10.

Microsoft has cautioned that devices running this version of the operating system will continue to operate, but they will no longer receive security and quality updates, and are potentially vulnerable to malicious attacks.

The company has also noted that the following versions of Windows 10 will be affected:

Windows 10 Home

Windows 10 Pro

Windows 10 Education

Windows 10 Enterprise

However, Microsoft will continue to provide security updates to devices running Windows 10 Enterprise 2015 LTSB or Windows 10 IoT Enterprise 2015 LTSB. The company explained that since it had already extended the end-of-support date once, it won't be doing so again. It stated:

Since the initial release of Windows 10 in July 2015, Microsoft has released two additional feature updates that build upon each other, delivering the newest features and more comprehensive security. Windows 10 was designed as a service, whereby feature updates are required a few times a year. For most consumers, both quality and feature updates are delivered automatically according to their Windows Update settings. By policy, devices need to install the latest feature update within a 60-day grace period of its release to continue to be eligible for monthly servicing with security updates and other quality updates. We extended this grace period for version 1507 beyond this typical 60-day policy, but the time has now come to end servicing for version 1507.

You can press the "Windows" + "R" combination on your machine, and type "winver" to check which version of Microsoft's operating system you're currently running. If it's version 1507, Microsoft recommends that you visit its Software Download site and manually update to a later version of Windows 10. The end of mainstream lifecycle dates for versions 1511 and 1607 aren't listed on Microsoft's website yet, while version 1703 is pegged at October 13, 2020.

Source: Microsoft via Softpedia