AD Security Groups removed from Outlook Membership

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Occasional Visitor

Image attached.... Why are we no longer seeing the AD Security Groups in this membership view anymore, and how can we get it back. We have a reason why we like it to see it.

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AD security groups are not valid Exchange recipients, thus Exchange ignores them. Easier way to check this is via the Get-Group cmdlet, if the group is visible there, it will be visible in the membership tab (for any members of course).