Norton AntiVirus 2011 & Outlook 2003

On a very regular basis I am recieving error messages thast my email sent by Outlook 2003 has not been sent due to a server time out.  I am using a 3rd party IMAP email that uses GMAIL as its source.  This error only began after I upgraded to NAV 2011.  It happens without rhyme or reason that I can determine.  Clearly something is amiss.