Warning! This registry hack will disable the Junk email filter in Outlook 2007 and 2010, including the blocked list, and disable the Junk email options button.
The ‘no automatic filtering’ setting in Outlook’s Junk email options disables the junk email filter but continues to apply the blocked senders list to incoming email. Some users complain that the filter continues to work after setting it to no automatic filtering and with the blocked list empty. This registry hack will completely disable Outlook’s built in filtering. It will not affect third party spam filters.
Go to the following key (use 14.0 if you use Outlook 2010) – if the key does not exist, add it.
Value: 1 (Hex)
Value of 1 disables the junk filter, 0 enables it.
You need to restart Outlook for it take effect. The Junk email folder will remain (but should not be created if you make a new default pst file) – you can delete the junk folder using OutlookSpy or MFCMAPI.
You can also disable RSS: see http://www.outlook-tips.net/archives/2008/20080829.htm