A skipped verion number between Office 12 (Office 2007) and Office 14 (Office 2010). See Microsoft Office versions.
"Office 13." YourDictionary, n.d. Web. 22 June 2018. <http://www.yourdictionary.com/office-13>.
Office 13. (n.d.). Retrieved June 22nd, 2018, from http://www.yourdictionary.com/office-13
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