Unable to manage Distribution list membership since moving from Exchange 2003 to Exchange 2010

Question

Hi,
We have recently started migrating from Exchange 2003 to Exchange 2010.  One of our customers used to be able to manage a security group through the outlook address book.  This is a mail enabled security group where the customer is on
the "Managed by" entry and the "Manager can update membership list" is ticked. 
Now that the users mailbox has been migrated to Exchange 2010, if they try and modify the membership using outlook by finding the group in the address book they get the error "changes to the distribution list membership cannot be saved. you do not have
sufficient permission to perform this operation on this object".
I have now added a test account to the managed by entry on the security group to test the problem.
I have followed the article
http://blogs.technet.com/b/exchange/archive/2009/11/18/3408844.aspx that explains how to use the EMS to give users the right to amend groups that users own.  I did not run the script but entered the following commands:
New-ManagementRole -name “MyDistributionGroupsManagement_Test” -parent MyDistributionGroups
Remove-ManagementRoleEntry “MyDistributionGroupsManagement_Test\New-DistributionGroup” -confirm:$false
Remove-ManagementRoleEntry “MyDistributionGroupsManagement_Test\Remove-DistributionGroup” -confirm:$false
New-ManagementRoleAssignment -name “MyDistributionGroupsManagement_Test-Default Role Assignment Pol” -role “MyDistributionGroupsManagement_Test” -policy “Default Role Assignment Policy”
All appears to have worked ok and I have seen no errors while doing this
If I use OWA and then use the ECP, I can now see the "Public groups I own" but no groups are listed.
I have created some new distribution groups in Exchange 2010 (One dist list and one security group) to test and added the test account as an owner of both and a member of both.  I still cannot amend the membership using outlook address book and the
ECP still shows no groups under "Public Groups I own"
I have seen a number of articles on how to do this and it looks like I am doing everything right and it has worked for plenty of other people.  I just don't know what's going wrong.
I would be very grateful if anyone can help. 
Matt

Answer 1

Hi Rajith,
I deleted the outlook profile and recreated it but this did not work.
I have now created a brand new mailbox on Exchange 2010 added this to the "managed by" section of the Exchange 2010 dist lists and I still get the error.  I also do not see the groups listed when logging in as that user to OWA ECP and clicking on the
Groups link.
I had a look at the link you sent me and I could see that from the Exchange server when I opened the User roles to get to the ECP, clicked on Roles and Auditing and then User Roles the only policy applied is "Default role assignment".  When I select
the details for this, under Distribution groups, "My Distribution Groups" is not ticked but my new one that I created "My DistributionGroupsManagement_Test" is.  So this looks ok.
Any other ideas?
Matt