In this short tutorial we will see how to make Outlook for Mac 2011 as the default application for e-mail, contacts and calendar. Click the Outlook menu and select Preferences from the menu list.
In the Outlook Preferences window, navigate to General option under the Personal Settings.
In the General Option window, navigate to Default application section and click the Make Default button. This would make outlook as the default application for e-mail, calendar and contacts on Mac OS X Lion.