exclude a group or ou from an existing exchange 2010 sp3 dynamic distribution group

I have an existing dynamic distribution group for all users
I need to exclude a group of users
im thinking the best way to achieve this would be to try to exclude an ou or group  maybe
anyone any ideas how I could do this?
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Hello WorldCommented:
It depend on the original RecipientFilter used for existing dynamic distribution group, for example:
((RecipientType -eq 'UserMailbox' -and ServerName -eq 'Server1' -and (Name -like 'Help Desk')))

You can use New-DynamicDistributionGroup to new a Dynamic distribution group with below filter:
((RecipientType -eq 'UserMailbox' -and ServerName -eq 'Server1' -and (Name -notlike 'Help Desk')))
More details about Exclude Members from Dynamic Distribution Group, for your reference:

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