Problem with modify members in distribution list

After moving mailboxes from Exchange 2007 to 2010 users have been unable to make modifications to distribution groups. Users are listed on both "Managed by" and "Security" tabs in AD and the "Group Information" tab in Exchange 2010. We tried to recreate the DL on Exchange 2010 but it did not resolve the issue. The Exchange 2007 server is still operational and after moving the users mailbox back to Exchange 2007 they were able to modify the distribution lists. Any idea what could be causing mailboxes on Exchange 2010 to not have modify rights on distribution lists?
ISHELPIT ManagerAsked:
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Hilal1924Commented:
Exchange 2010 Works on Role Based Access Control and will need to have Proper Permissions to make Modifications which are different from Exchange 2007

Follow this article please:

http://www.corelan.be:8800/index.php/2009/05/21/delegating-exchange-2007-distribution-list-management-to-end-users/

Hilal
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Hilal1924Commented:
Sorry, Disregard the above Link as it is meant for Exchange 2007. Here is some Info:

http://muc-ug.org.in/index.php/articles/exchange-2010/115-exchange-2010-role-based-access-control.html

Hilal
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Satya PathakLead Technical ConsultantCommented:
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ISHELPIT ManagerAuthor Commented:
The article linked didn't address my specific issue but gave a good starting point to work from.
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