The Spinning Wait cursor is displayed, and the application status is displayed as 'Not Responding.' This issue occurs in Outlook for Mac 2011 version 14.5.5 and earlier versions when they are running on Mac OS X El Capitan (version 10.11). For more information, check out this knowledge base article documenting the problem: Shortly after you start Microsoft Outlook for Mac 2011 on Mac OS X El Capitan (version 10.11), Outlook hangs when it tries to sync with the server. Microsoft has an update to fix the problem now. Microsoft Office and Outlook 2011 apps get bug-fixes for app crashes and syncing issues on OS X El Capitan. I am right in the middle of writing an article and it has turned into a nightmare. I reinstalled Office 2011 but to no avail. Strangely enough there seems to be no solution. El Capitan update 10.11.6 has rendered Microsoft Word 2011 unusable. › ▆ Ms Excel For Mac 2011 Crashes El Capitan