Outlook 2002 error 0x80004005 when sending attachments through Exchange 5.5

We have recently upgraded Outlook on a few machines from 2000 to 2002.  The computers are running Windows 2000, Windows XP Pro and Windows 2000 Terminal Server. On the back-end, we're using Exchange 5.5 running on Windows 2000 Server (NT Domain) with Symantec Antivirus for MSE in MAPI/VAPI combination mode.  We've found that when sending attachments, we're presented with this error message that never came up with OL 2000:

Task 'Microsoft Exchange Server - Sending' reported error (0x80004005) : 'The operation failed.'

The error appears on the "Errors" tab of the "Outlook Send/Receive Progress" dialog.  Even though we get this message, the email stays in the outbox and goes out successfully moments later.

Additionally, we upgraded another instance of Office to Outlook 2003 with a similar, but not exact problem.  Under 2003, the message goes out, but bounces back.  The error on the bounced message complains that the message is being scanned for viruses.  Under 2003, the message never goes out.  It must be resent several times before it actually goes out.
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RadioActiveLambAsked:
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Mob-bomCommented:
Hi RadioActiveLamb

Not sure if this helps because it speaks specifically about receiving emails, but it is discusses Norton AntiVirus and you said >>> the message is being scanned for viruses>>> so it may be applicable to you:

http://support.microsoft.com/default.aspx?scid=kb;en-us;329936&Product=out
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RadioActiveLambAuthor Commented:
That problem only relates to the retail version of NAV.  This is Norton Antivirus for Microsoft Exchange v2.11 (build 56), which does not have a script blocking feature.  Also, as you noted, this doesn't apply to sending messages.  

Thanks for the reply.
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RadioActiveLambAuthor Commented:
This is still a nagging problem.  I'm not certain if the problem is Outlook or the Exchange 5.5 SP4 back-end.  

I added some more points to the hook.
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Mob-bomCommented:
Hi RadioActiveLamb

If you haven't resolved your issue yet, you may want to review:

Email with attachments remain in the Outlook outbox when VAPI or Combo mode is used with Norton AntiVirus for Microsoft Exchange 2.1x

Situation:
When using a MAPI client like MS Outlook, some email messages with attachments remain in the client outbox and are never sent. The message is sent and delivered immediately when sent again from the outbox. Norton AntiVirus for Microsoft Exchange (NAVMSE) 2.1x is installed on the Exchange server, and is configured to run in VAPI or in MAPI/VAPI (combo) scanning mode. You want to know why the emails are not being sent initially.

http://service1.symantec.com/SUPPORT/ent-gate.nsf/361fc4a260e563b1882568180069e1c0/ab55b486ebc3ccfa88256bd0007e4d5f?OpenDocument&prod=Norton%20AntiVirus%20for%20Microsoft%20Exchange&ver=2.x&src=ent&pcode=nav_exchange&dtype=corp&svy=&prev=&miniver=nav-ms-exchange2
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