From http://support.microsoft.com/kb/284204

Numeric Code: 4.4.7

Possible Cause: The message in the queue has expired. The sending server
tried to relay or deliver the message, but the action was not completed
before the message expiration time occurred. This NDR may also indicate that
a message header limit has been reached on a remote server or that some
other protocol timeout occurred during communication with the remote server.
Troubleshooting: This code typically indicates an issue on the receiving
server. Verify the validity of the recipient address, and verify that the
receiving server is configured to receive messages correctly. You may have
to reduce the number of recipients in the header of the message for the host
that you are receiving this NDR from. If you resend the message, it is
placed in the queue again. If the receiving server is on line, the message
is delivered.


Obviously, if its an update, the address and # of recipients should be ok.
Does the NDR give any clues as to why its not getting sent or accepted by
the outside server?

--
Diane Poremsky [MVP - Outlook]
Author, Teach Yourself Outlook 2003 in 24 Hours
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"laura" wrote in message
...
Users in our organization are reporting an issue when sending meeting
updates. The first time they send the meeting request to internal
employees
or outside customers, everything is fine and the meeting schedules without
a
problem. If the organizer needs to make a modification to the meeting,
say
the time, an undeliverable report will be sent to them that it did not
reach
all recipients, but only for outside email addresses. The undeliverable
does
not come back right away. The email appears to sit in the queue until it
times out. The undeliverable received is "could not deliver the message
in
the time limit specified. 4.4.7". So to the organizer, they think
everything
has been sent out and updated without any problems because they don't
receive
any undeliverable right away. We are running Exchange 2003 and all users
have Office 2007. Any help would be appreciated.

Thanks!
Laura