Previous versions of Windows
Windows 8.1
Released in 2013 as an upgrade to Windows 8, Windows 8.1 offers new manageability, mobility, security, user experience, and networking capabilities. It delivers the experiences users want while providing IT with a more secure, easy-to-manage infrastructure.
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Windows Phone 8.1
Released in 2014, Windows Phone 8.1 is an upgrade to the Windows Phone 8 operating system that provides IT departments with more control over Windows Phones and users with a fuller productivity experience.
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Windows 7
Released in 2009, the Windows 7 operating system is designed to meet the evolving needs of end users and IT professionals—both in and out of the office. It performs well on the same hardware that runs Windows Vista, while delivering additional performance and reliability improvements.
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Windows Vista
Released in 2007, the Windows Vista operating system is designed for use on desktop computers, laptops, tablets, and media centers. Microsoft currently supports Windows Vista with Service Pack 2 (SP2), which includes all previously released updates for the Windows Vista operating system as well as support for new types of hardware and emerging hardware standards.
Windows XP
Released in 2001, Windows XP is no longer supported by Microsoft.