Shared Contact Lists in Exchange

Hi have a client who has several Shared contact list like Staff all  or Staff Complete to send to all users  within that list Not all shared Contact lists are not working just certain ones. Any suggestions would be great thanks in advance for any help. this is in Outlook 2010.

This is the error they get "An internal support function returned an error"
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Try repairing office 2010 and check if this helps to resolve the issue:
Click on Start > Control Panel > Add or Remove Programs /Programs and Features/Uninstall a Program > Highlight Office 2010 or Outlook 2010 > Click on Change > Repair

Also have seen google posts, where people are saying about duplicate entries in the list could possibly cause this error to show up.

gud luck
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