Microsoft Office is an office suite of desktop applications, servers and services, released by Microsoft on August 1, 1989 for the Microsoft Windows and Mac OS X operating systems. Originally, the first version of Microsoft Office contained Microsoft Word, a word processor and was previously considered the main program in Office; Microsoft Excel, a spreadsheet program that originally competed with the dominant Lotus 1-2-3; and Microsoft PowerPoint, a popular presentation program for Windows and Mac.; a marketing term for a bundled set of applications. As years passed by, Office applications have grown significantly closer with shared features such as a common spell checker, Object Linking and Embedding (OLE) data integration and Microsoft 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. The current versions are Office 2010 for Windows, released on June 15, 2010; and Office 2011 for Mac OS X, released October 26, 2010.The new Office 2013 (version 15 of the Office suite) is reported to be released around December 2012.