When Outlook 2007 or Outlook 2010 is running in Cached mode, users do not see some new e-mail messages.
This problem occurs because the ItemProcSearch search folder does not receive notifications that indicate new e-mail messages have arrived, and the e-mail messages are flagged as hidden. Therefore, the e-mail messages are never processed.
To resolve this problem in Outlook 2007, follow these steps:
Exit Outlook 2007.
Install the 2007 Microsoft Office suite Service Pack 2.
Click Start, click Run, type outlook/cleanips, and then click OK.
To resolve this problem in Outlook 2010, click Start, click Run, type outlook/cleanips, and then click OK.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.