Creating an add-on for Microsoft Word is a great way to personalize your word processing application. Microsoft Office comes with a built-in add-on editor, in older versions it is called Visual Basic for Applications or VBA; in Office 2007 and later versions, it is called Visual Studio Tools for Applications, or VSTA.
Users can use the editors to create add-ons that are universal and can be used in Word, Access, Excel or they can create specific add-ons that will only be used in one Office application, such as Word.
Among other things, users can make Word add-ons that automatically add letterheads or watermarks to documents, create buttons or new toolbars or install add-ins for specific documents like login or informational pop-up boxes.