I have a Dynamic Distribution Group in Exchange 2010. The only recipient filter I've added to it is to exclude mailboxes with a specific custom attribute on them (effectively it is excluding 1 mailbox for my purposes).
From the Exchange 2010 EMC, if I open up the properties of the Dynamic Distribution Group and go to Filter tab and click "Preview", I see the proper recipients (about 250 of them it looks like).
However, if I go to manage this group in OWA, or I run a powershell query with Get-Recipient -RecipientPreviewFilter $GroupName.RecipientFilter, it will list like 900 recipients.
How can I get an accurate report of the recipients? Because I cannot export from the Filter > Preview button.