I would start with detect and repair (office diagnostics) and then check the
DL - my guess is one of the addresses on the DL is corrupt.

--
Diane Poremsky [MVP - Outlook]
Author, Teach Yourself Outlook 2003 in 24 Hours
Need Help with Common Tasks? http://www.outlook-tips.net/beginner/
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"GillesL" wrote in message
...
I recently upgraded from Outlook 2003 to Outlook 2007. The 2007 version
automatically converts all the 2003 files. The problem I am having is that
when I need to send a mass e-mail to a distribution list, I get the
following
message "An Internal Support function returned an error".

I've checked everywhere on these boards and found a few explanations, but
I
cannot find my old PST files from the 2003 version. I have many other
distribution lists with less contacts in them and they work fine, there is
only one large one (300 contacts) that does not work.

Could someone help me with this?