Microsoft Windows 7 and Windows 8.1 are no longer for sale to system builders starting this month.

Two years ago, the company started pulling versions of Windows 7 from the market. The last day on the market for Windows 7 Professional was Oct. 31.

Users who still want to get a copy of the two operating systems can purchase them from the official website of the company. Both operating systems are supported by AMD Carrizo and Skylake platforms while Kaby Lake, Bristol Ridge, and other forthcoming AMD and APU platforms will only carry Windows 10.

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Meanwhile, Windows 10 has received indefinite support as Microsoft said that it would be the final version of the operating system that the company will build, Extreme Tech reported. 

Windows 10 is popular among gamers, accounting for 47.28 percent of the Steam market while Windows 7 64-bit and Windows 8.1 64-bit garnered 28.99 percent and 8.63 percent respectively. In 2015, the 64-bit version of Windows 7 topped the Microsoft operating system list, garnering 37.48 percent of the Steam market.

Windows 7 users would still get important updates as Microsoft has extended its support until Jan. 2020.