Office 365 (Outlook 2011) - Disabling Spam Filter
It is recommended that you disable Outlook's built-in spam filter if you plan to use Outlook with Office 365. This document provides step-by-step instructions on how to disable your spam filtering in Outlook 2011. Spam filtering is enabled by default on initial setup.
Manually Disable Spam Filter Setting
Open Outlook 2011.
Click on the Home tab to view a list of menu options.
Click on the Junk drop down menu, then select Junk Email Protection...
Click on the Level tab, select None, then click OK.
Your spam filter is now disabled.