High Quality Content by WIKIPEDIA articles! Microsoft Entourage is an e-mail client and personal information manager developed by Microsoft for Mac OS 8.5 and higher. Microsoft first released Entourage in October 2000 as part of the Microsoft Office 2001 office suite; Office 98, the previous version of Microsoft Office for Mac OS, included Outlook Express 5. The current version is Entourage: Mac 2008, released as part of Microsoft Office 2008 for Mac on January 15, 2008. Microsoft announced on August 13, 2009, that Entourage would be replaced by Outlook for Macintosh in the next release of Office for Mac, due in late 2010.