Microsoft WORD

Microsoft Word is Microsoft's word processing software. It was first released in 1983 under the name Multi-Tool Word for Xenix systems. ersions were later written for several other platforms including IBM PCs running DOS (1983), the Apple Macintosh (1984), SCO UNIX, OS/2 and Microsoft Windows (1989). It is a component of the Microsoft Office system; however, it is also sold as a standalone product and included in Microsoft Works Suite. Beginning with the 2003 version, the branding was revised to emphasize Word's identity as a component within the Office suite; Microsoft began calling it Microsoft Office Word instead of merely Microsoft Word. The latest releases are Word 2007 for Windows and Word 2008 for Mac OS X.

Like other Microsoft Office documents, Word files can include advanced macros and even embedded programs. The language was originally WordBasic, but changed to Visual Basic for Applications as of Word 97.

This extensive functionality can also be used to run and propagate viruses in documents. The tendency for people to exchange Word documents via email, USB key, and floppy makes this an especially attractive vector. A prominent example is the Melissa worm, but countless others have existed in the wild. Some anti-virus software can detect and clean common macro viruses, and firewalls may prevent worms from transmitting themselves to other systems.

These Macro viruses are the only known cross-platform threats between Windows and Macintosh computers and they were the only infection vectors to affect any Mac OS X system up until the advent of video codec trojans in 2007. Microsoft's released patches for Word X and Word 2004 effectively eliminated the Macro problem on the Mac by 2006.

Word's macro security setting, which regulates when macros may execute, can be adjusted by the user, but in the most recent versions of Word, is set to HIGH by default, generally reducing the risk from macro-based viruses, which have become uncommon.

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