Outlook Send Error: You do not have the permission to send the message on behalf of the specified user.

I have a Windows XP Pro PC with MS Office 2003 and all service packs.  Our office uses Exchange 2003 on a Windows 2003 Server.  All users are sending mail fine, but 1 user who has been working fine for over 2 years all of a sudden is receiving a message everytime she sends mail:

Heading:  Microsoft Office Word

Message:  You do not have the permission to send the message on behalf of the specified user.

She cannot send any messages.  

We reloaded MS Office 2003 on the PC, and have checked the Outlook settings to be sure there is no name in the "From" line in the message when sending.  I think it's an Exchange issue but haven't been able to find anything online to help.
ttelescaAsked:
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MATTHEW_LCommented:
You may try deleteing the outlook profile, removing the PC from the domain, rejoin it.  Re-set up the outlook profile and test.
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and235100Commented:
This sounds like the Delegates function is being used.

Go to Tools, Options, delegates tab - and check for any users listed in there.
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ttelescaAuthor Commented:
I don't see a Delegates function.  Is this in Outlook or somewhere on the Exchange server?
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ttelescaAuthor Commented:
Sorry, I found it.  Nothing in there.
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and235100Commented:
Okay - then you will have to go through your mailboxes - and see if anyone has set the particular user up with delegate rights to their inbox.

This kind of error could occur after a password change (possibly)

Or - you could back the user's data (and mailbox) up - using USMT (http://www.microsoft.com/downloads/details.aspx?FamilyID=799ab28c-691b-4b36-b7ad-6c604be4c595&DisplayLang=en)

Then recreate the user in AD.
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MATTHEW_LCommented:
You may also check her mailbox permissions as well.  Make sure they look like those of users that are working.

You can try this script to report on delegates throughout your organization.
http://gsexdev.blogspot.com/2006/08/reporting-on-meeting-delegate-forward.html 

Definatly check the users permissions to their own mailbox though.
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ttelescaAuthor Commented:
I set up roaming profile for this user, logged onto another machine, and it works fine.  So, I assume this means it's a local issue.  I reloaded Office 2003, didn't work, so I upgraded to 2007, still doesn't work.

Sounds like something in the registry.

Any ideas?
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and235100Commented:
Does this still happen with another user on this PC?
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and235100Commented:
You may have to implement the settings on here:
http://support.microsoft.com/kb/912918
(under RESOLUTION)

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and235100Commented:
@ MATTHEW_L

That isn't really a solution.

The Asker has not got to the bottom of why this happened - and now he/she is not any further ahead, if the problem happens again.
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