Full error msg is "Cannot perform the requested operation. The command is not
valid for this recipient. The operation failed."

I receive this when I use a distribution list in an email and press the + to
expand the group members. I tried this because all of a sudden Outlook
(2003) refuses to send any email where I use a distribution list - it give me
the error message "An unexpected error has occurred".

Earlier tonight it started giving me the error message "an internal support
function returned an error" - so I restarted my machine but still the same.
Then after searching this form for ideas I removed the Outlook address book
from the directories (under Tools \ Email Accounts \ Directories), restarted
Outllok, and then put it back. Now I get "An unexpected error has occurred".

I can manually select the peopl in my distribution list and successfully
send the email, but I don't want to have to keep doing that forever.

I recently moved the mail file from the C: drive onto my D: drive but seeing
my contacts are within the outlook PST file that shouldn't matter - if it
does what do I need to do to fix it?

I have tried setting up a brand new dist list - that fails too.

What do i need to do to fix it?