To resolve the issue:
1. Close Outlook and delete the cached files on ..\Documents and Settings\UserName\Local Settings\Application Data\Microsoft\FORMS.
Note: The path differs on each user’s environment.
2. Open the Approved Senders list.
3. Open a Spam message and then click View Approved Sender List.
After executing Steps 2 and 3, and the Approved Senders list is not yet recovered, delete the Spam Mail folder manually. EUQ housekeeping will recover your Spam Mail folder.
4. Once EUQ recovered the Spam Mail folder, open the Approved Senders list by doing Step 3."