If your in the Exchange EMC and get an error when you try and edit the recipient policy like the one below :
The specified e-mail address policy couldn’t be edited. E-mail address policies created with legacy versions of Exchange must be upgraded using the ‘Set-EmailAddressPolicy’ task, with the Exchange 2010 Recipient Filter specified
Then you need to upgrade the policies that have been migrated from exchange 2003. This can be done in one line
Get-EmailAddressPolicy | where {$_.RecipientFilterType –eq “Legacy”} | Set-EmailAddressPolicy –IncludedRecipients AllRecipients