An internal support function returned an error

Outlook 2007, SBS 2008.
Distribution list, lost of members.

Just recently, send to the list and get an error "An internal support function returned an error".

If we send from a web browser, we do not get the error.
If henlogs onto another machine, he gets the error.

Any ideas?
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dougp23Asked:
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nazg82Commented:
Hi,

1. Check all recipients in de Distribution list for duplicates. Remove duplicate members.
2. Open the Distribution list to view all members and select the Update Now button.
3. Create a new message and just start typing the name of the distribution list in the To: field and once auto-fill completes the entry, select delete on the keyboard. The distribution list will then be deleted from the NK2 file of the user.
4. Try to re-use the distribution list by starting a new message, press the To: button and find the distribution list. Add the list to the To: Field.
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