If you don't see Office listed, your plan probably doesn't include Office applications. If you know your plan includes Office, you may not have a license assigned, If Office is not listed ask your Office 365 administrator to assign a license to you.
Install Outlook for Mac for Office 365
You can install Outlook for Mac side-by-side with your installation of Office for Mac 2011, but it's recommended you remove the Outlook for Mac 2011 Dock icon and launch Outlook for Mac using the new icon.
Delete the Outlook for Mac 2011 icon from the Dock
In the Dock, drag the Outlook for Mac 2011 app to the Trash (located at the end of the Dock).
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