Always use the version specific tag for your version of Microsoft Word unless asking a general non-version specific question.

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Microsoft Word is the word processor included in the suite.

Format Compatibility

In Word 2007, Word has adopted the Office Open XML format and a file extension .docx, which is not compatible with the older Word format, .doc. However, Microsoft has provided compatibility plugins for the older versions of Word, and Word 2007 can open .doc files.

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