The Office Assistant is a discontinued intelligent user interface for Microsoft Office that assisted users by way of an interactive animated character which interfaced with the Office help content. It was included in Microsoft Office for Windows, in Microsoft Publisher and Microsoft Project, Microsoft FrontPage, and Microsoft Office for Mac. The Office Assistant used technology initially from Microsoft Bob and later Microsoft Agent, offering advice based on Bayesian algorithms.

Microsoft Office, or simply Office, is a family of client software, server software, and services developed by Microsoft. It was first announced by Bill Gates on August 1, 1988, at COMDEX in Las Vegas. Initially a marketing term for an office suite, the first version of Office contained Microsoft Word, Microsoft Excel, and Microsoft PowerPoint. Over the years, Office applications have grown substantially closer with shared features such as a common spell checker, Object Linking and Embedding data integration and Visual Basic for Applications scripting language. Microsoft also positions Office as a development platform for line-of-business software under the Office Business Applications brand.