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Microsoft Word is a word processor program developed by Microsoft. It was first released on October 25, 1983, under the name Multi-Tool Word for Xenix systems. Subsequent versions were later written for several other platforms including: IBM PCs running DOS (1983), Apple Macintosh running the Classic Mac OS (1985), AT&T UNIX PC (1985), Atari ST (1988), OS/2 (1989), Microsoft Windows (1989), SCO Unix (1990), macOS (2001), Web browsers (2010), iOS (2014) and Android (2015). Commercial versions of Word are licensed as a standalone product or as a component of Microsoft 365 suite of software, which can be purchased either with a perpetual license or as part of a Microsoft 365 subscription, respectively.