outlook an internal support function returned an error

I am using outlook 2003 off an exchange 2003 server. I am logged in as admin and can send an email to a distribution list ok from a shared contacts entry. The user can select the same entry but gets "an internal support funtion returned an error" when they try send. The have ownership rights to the shared contacts. When they try expand out the distribution list from within the email they get error cannot perform requested operation the command selected is not valid for this recipient. could not complete the operation. one or more parameter values are not valid.

I checked all the address and they look fine. any ideas
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Are you creating group the in Active directory with the same permissions?
Sid_FAuthor Commented:
no, its no ad group its in an address book, I should of said contact group as oppose to distribution group
Sid_FAuthor Commented:
just to clarify, I can login to the server as admin and send an email using a contact group from shared contacts, some users get the error "an internal support funtion returned an error" when they click on send, when they try to expand the group they get another error "cannot perform the requested operation. The command selected is not valid for this recipient. Could not complete the operation. One or more parameter values are not valid.

How do I know which one is causing the problem as all the addresses look ok
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Sid_FAuthor Commented:
wow this is a strange issue after hours of testing. Here is an example, I created a seperate test shared contacts and created a distribution list, the user was able to send mail fine with five test contacts I added the rest one by one, once i got the error there was no going back even rolling back the last user added did not fix the problem.
I had the same problem still on the main shared contacts however I noticed by removing three or four random users (they could be internal or external contacts) I was able to send mail and expand the group out again but also the original address list also started to work.
I am stumped! I did an update of office to sp3 which made no difference I am in the middle of applying all server updates.
If you are sending mails to the DL
At E2k3, DL --> properties --> Exchange Advanced --> Expansion server

>> see if there is any server configured
Else, you can toggle to provide the closest server for this DL and see the behaviour

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Sid_FAuthor Commented:
unfortunately I no longer have access to this server to try any more on it. thanks for the help.
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