The issue focused on Microsoft's Windows Vista operating system. Apple Computer introduced its Macintosh computers with Mac OS X software for PCs in 1997. IBM followed suit with Windows NT 4.0 software for PCs and tablets in 1999. Microsoft Windows XP software became available for PCs and laptops in 2001. Microsoft Windows Vista software became available for PCs and laptops in 2006. Microsoft Windows 8 software became available for PCs and laptops in October 2012. Microsoft Windows 10 software became available for PCs and laptops in July 2015. The Software Quality Alliance monitors