Recent versions of Office are referred as "Office system".
Office was introduced by Microsoft in 1989 on the Mac, with a version for Windows in 1990. Initially a marketing term for a bundled set of applications, the first version of Office contained Microsoft Word, Microsoft Excel, and Microsoft PowerPoint. Additionally, a "Pro" version of Office included Microsoft Access and Schedule Plus. Over the years, Office applications have grown substantially closer with shared features such as a common spell checker, OLE data integration and Microsoft Visual Basic for Applications scripting language. A major feature of the Office suite is the ability for users and third party companies to write Component Object Model add-ins, which are supplemental programs that extend the capabilities of an application by adding custom commands and specialized features. Microsoft also positions Office as a development platform for line-of-business software.
The current versions are Office 2007 for Windows, launched on January 30, 2007, and Office 2008 for Mac, released January, 2008. Office 2007, announced on February 15, 2006, was released on November 30, 2006 for businesses via volume License and MSDN channels. It features a distinct user interface and a new XML-based primary file format.