The domain "%s" has been identified as an insecure domain for mail-enabled groups with hidden DL membership. Hidden DL membership ...

The domain "%s" has been identified as an insecure domain for mail-enabled groups with hidden DL membership.  Hidden DL membership will be exposed to members of the built-in "Pre-Windows 2000 Compatible Access" security group.  This group may have been populated during the promotion of the domain with the intent of allowing permissions to be compatible with pre-Windows 2000 servers and application.  To secure the domain, remove any unnecessary members from this group.
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