How to edit distribution lists via Outlook 2008

Since upgrading to Exchange 2010 from 2007, our users have lost the ability to make changes to distribution lists that they own. Permissions in EMC are set for the owner to be able to make changes but when the owner tries he gets a insufficient privileges error. Has anyone seen this before?

thanks in advance
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BusbarSolutions ArchitectCommented:
This is due in correct Exchange webservices settings, have you verified that you have internal and External URLs configured correctly, also make sure that users are conecting using TCP not HTTPs
Stacy SpearPresident/Principal ConsultantCommented:
What is Outlook 2008?
BusbarSolutions ArchitectCommented:
looks a type error
it-shutterflyAuthor Commented:
Outlook 2007.
Busbar - Confirmed that Outlook connects through TCP but still get error message. More research found this article which eventually fixed the problem....thank you much for the suggestion

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Stacy SpearPresident/Principal ConsultantCommented:
Just wanted to make sure it wasn't one of those "one off" productions from Redmond. I have a few of those in our enterprise.

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