How do I exclude an OU from an Exchange 2010 dynamic distribution group?

intlfcs_krismortensen
intlfcs_krismortensen used Ask the Experts™
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I have an Exchange 2010 dynamic distribution group that needs to have a particular OU excluded from its criteria.  How can I do this?
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Commented:
You have to append a custom attribute to users in this OU. For example Get-Mailbox -OrganizationalUnit "OU=Test,DC=Contoso,DC=com" | Set-Mailbox -CustomAttribute1 "test"

Then you create the DDL filter to exclude custom attribute -notlike (-ne) test
Based on your answer, it looks like this should be done in Exchange Management Shell?  The reason I say that is that when I get the properties of the existing dynamic group, the conditions tab only allows me to select "Custom Attribute 1 equals Value" (as opposed to 'does not equal value).  If this is a shell based solution, what is the syntax that I would use to modify the existing group in such a way?

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