Outllook 2007 0x80040201 Error when sending

I have a customer who used to get their email via Exchange server.  They've left their email provider, and I now have them set up in Outlook using IMAP.

Before the switch I exported their Exchange email to a PST.

I removed the Exchange account, and added the PST of exported email.  Send/receive seems to work for all domains except his own.  When I try to send an email to anyone on his own domain, I get a send/receive error of 0x80040201.  I repaired all PSTs using ScanPST.  No difference.

I figured out that if I remove the old exported Exchange PST file, it works fine.  Having that PST file in Outlook is causing a problem.

I created a new empty PST, added it as a data file.  Removed the old PST of exported Exchange mail.  Ran Outlook and imported the old email into the new empty PST.  No difference.

Anyone encountered this?  I've never seen this kind of issue before.
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JohnBusiness Consultant (Owner)Commented:
Open up Send / Receive window (Click on Details >>) and then let us know what the error is (it should give some words outlining a reason, not just an error code).
DaveWWWAuthor Commented:
No details - just "unknown error".

I have just figured it out, however: It is the autocomplete function.  When the autocomplete is tied to a contact entry in the old Exchange database, it puts the correct name in the To: box, but it results in an error on send.

The remedy is to bring up the entry in autocomplete, and then press the delete key to remove it, then re-enter the correct address.

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JohnBusiness Consultant (Owner)Commented:
Perhaps clear Autocomplete and send from Contacts. Autocomplete will quickly rebuild.
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DaveWWWAuthor Commented:
Well, in this case that's not really necessary, as the offending contacts are few (perhaps only 5 or so).  All other contacts behave normally, as it turns out.
JohnBusiness Consultant (Owner)Commented:
Then just remake the 5 autocomplete entries you need to remake.  So far as I know, you cannot selectively delete autocomplete entries, so you need to try to change them.
DaveWWWAuthor Commented:
I've been able to delete autocomplete entries on a one-by-one basis by simply typing the start to their name or address.  Then as it comes up, use the arrow keys to highlight it, and press delete.  It's handy for deleting incorrect email addresses in autocomplete, for example.
DaveWWWAuthor Commented:
Thanks John.  As I mentioned earlier, simply deleting the autocompletes that weren't working turned out to be the solution in this case.
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