We need some additional information to try and troubleshoot:
-Which version of OS X?
-Which version of Microsoft Office/Entourage?
-How many email accounts are setup?
-Do you have any rules/filters setup?
-Have you left Entourage open overnight to allow all email to be processed?
-Is there email collecting in a junk folder perhaps?
-Do you happen to have Skype installed and running as well?
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