Exchange 2010 and VLV

and intersting not for those who might miss it
Install Exchange 2010 in an Existing Exchange 2003 Organization: Exchange 2010 Help: "Exchange 2010 now creates system address lists in a new container. Recipients created or modified using Exchange 2003 or Exchange 2007 management tools won’t be stamped with these system address lists. As a result, they won’t be seen by the Get-Recipient cmdlet.
To fix this issue, you must enable Active Directory virtual list view (VLV). After you have completed the upgrade of an existing Exchange 2003 organization to Exchange 2010 and have decommissioned your Exchange 2003 servers, you must enable Active Directory VLV. To enable VLV for Exchange 2010, run the Enable-AddressListPaging cmdlet. For more information, see Enable-AddressListPaging."