Can't Manage Distribution Group via Outlook 2007

I currently have an Exchange 2003 Mailbox server, Exchange 2007 CAS, 2010 CAS and 2010 Mailbox server.  The 2003 and 2007 are being phased out to be replaced by 2010.  I have an all 2008 R2 Active Directory Domain.  No other domain or forrests.  I granted a person the right to manage a Dist. Group but everytime she goes in to add/remove members she gets "Changes to the public group membership cannot be saved.  You do not have sufficient permission to perform this operation on this object."  However, she does.  I am a domain admin and I get the same error, but if I open up Active Directory Users and Computers I can do everything fine.
thelink12Asked:
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endital1097Connect With a Mentor Commented:
you need to look at this blog post and take the action specified in the article
http://msexchangeteam.com/archive/2009/11/18/453251.aspx

you may also need to run the following
$g = Get-DistributionGroup <DgName>
$g.ManagedBy += (Get-Mailbox <user>).DistinguishedName
Set-DistributionGroup $g -ManagedBy $g.ManagedBy
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