Microsoft Office is an office suite of desktop applications, servers and services for the Microsoft Windows and OS X operating systems. It was first announced by Bill Gates of Microsoft on August 1, 1988 at COMDEX in Las Vegas.
http://en.wikipedia.org/wiki/Microsoft_Office

Microsoft Word is a word processor developed by Microsoft. It was first released in 1983 under the name Multi-Tool Word for Xenix systems.[3][4][5] Subsequent versions were later written for several other platforms including IBM PCs running DOS (1983), Apple Macintosh running Mac OS (1985), AT&T Unix PC (1985), Atari ST (1988), SCO Unix (1994), OS/2 (1989), and Microsoft Windows (1989).
http://en.wikipedia.org/wiki/Microsoft_Word

Microsoft Word многим обязан Bravo — текстовому процессору с оригинальным графическим интерфейсом, разработанному в исследовательском центре «Xerox PARC». Создатель Bravo Чарльз Симони (Charles Simonyi) покинул PARC в 1981 году. Тем же летом Симони переманил Броди, с которым вместе работал над Bravo.
Первый выпуск Word для MS-DOS состоялся в конце 1983 года. Он был плохо принят рынком, продажи снижало наличие конкурирующего продукта — WordPerfect.
Хотя MS-DOS и являлась текстовой операционной системой, лишённой графической оболочки, Word для DOS был первым текстовым процессором для IBM PC, который был способен отображать разметку текста, например, полужирный или курсивный текст в процессе редактирования.
http://ru.wikipedia.org/wiki/Microsoft_Word

Beginning in 1979, started by Steve Jobs and led by Jef Raskin, the Apple Lisa and Macintosh teams at Apple Computer (which included former members of the Xerox PARC group) continued to develop such ideas. The Macintosh, released in 1984, was the first commercially successful product to use a multi-panel window interface. A desktop metaphor was used, in which files looked like pieces of paper. File directories looked like file folders. There were a set of desk accessories like a calculator, notepad, and alarm clock that the user could place around the screen as desired; and the user could delete files and folders by dragging them to a trash-can icon on the screen.
There is still some controversy over the amount of influence that Xerox's PARC work, as opposed to previous academic research, had on the GUIs of the Apple Lisa and Macintosh, but it is clear that the influence was extensive, because first versions of Lisa GUIs even lacked icons. These prototype GUIs are at least mouse-driven, but completely ignored the WIMP ( "window, icon, menu, pointing device") concept. Screenshots of first GUIs of Apple Lisa prototypes show the early designs. Note also that Apple engineers visited the PARC facilities (Apple secured the rights for the visit by compensating Xerox with a pre-IPO purchase of Apple stock) and a number of PARC employees subsequently moved to Apple to work on the Lisa and Macintosh GUI. However, the Apple work extended PARC's considerably, adding manipulatable icons, and drag&drop manipulation of objects in the file system (see Macintosh Finder) for example. A list of the improvements made by Apple, beyond the PARC interface, can be read at Folklore.org.[9] Jef Raskin warns that many of the reported facts in the history of the PARC and Macintosh development are inaccurate, distorted or even fabricated, due to the lack of usage by historians of direct primary sources.[10]
http://en.wikipedia.org/wiki/History_of ... le_IIgs.29

While jointly developing a new OS with IBM in 1984, OS/2, Microsoft released Microsoft Windows, a graphical extension for MS-DOS, on November 20, 1985.
http://en.wikipedia.org/wiki/Microsoft