Two users calendar invite meeting request get stuck in the smtp queue in Exchange 2003 R2 (64Bit)

I have an Exchange 2003 server I take care of with an occasional problem. Two user sending calander invite meeting request to multiple external users at multiple domains has the message become stuck in the queue for the outbound connector. I don't know if this happens with all her meeting cancellations sent to external users but it is at least some. It may also happen with meeting requests but I can't, at this point, be sure. Here's what I know:
1) It's only this two user who experiences the issue.
2) The queue for the "Default Outbound" SMTP connector goes into retry and other messages appear to be stuck behind this one.
3) The message causing the issue usually - maybe always - has multiple external recipients.
4) It today's case, the message is large-ish (37,627). I'm not sure if that's always the case6
5) Looking at message tracking, the last entry shows "SMTP: Message Routed and Queued for Remote Delivery"
6) There is nothing in the SMTP logs related to this message. This indicates to me that it is not getting as far as a delivery attempt by the SMTP service to any remote server.

This is an Exchange 2003 R2 (64Bit) server,
high_soboAsked:
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high_soboConnect With a Mentor Author Commented:
I used the hotfix from Microsoft and it's working now.
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Jason WatkinsConnect With a Mentor IT Project LeaderCommented:
Is there a sending policy which restricts message size? Is that 37MB?
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high_soboAuthor Commented:
No there's no restrict message size of 37MB
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
Are you sure on versions there?
Exchange 2003 is 32 bit only. Exchange 2003 doesn't install on 53 bit Windows.
Message tracking shows the message was processed by Exchange, so the connection issue has to be outside of Exchange. What is between Exchange and the internet?

Simon.
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high_soboAuthor Commented:
Firebar & Sembee2,
I ended up using an unpublished hotfix from Microsoft.  However I wanted to reward both of you with points for your gracious time and interest attempting to help me solve my issue!

Thank you
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