"Upgrade Default Address Lists from LDAP Filters to OPATH Filters
LDAP syntax filters are supported in Exchange 2010 and will exist only on objects that have been migrated from Exchange 2003 or earlier versions. You must upgrade these LDAP filters to the OPATH syntax only if you want to edit the filter from an Exchange 2010 server. For example, if you have Exchange 2003 servers in your organization, you can manage the LDAP syntax filter from an Exchange 2003 server. You can't manage or create LDAP syntax filters in Exchange 2010.
The following default address lists may need to be upgraded:
- All Users
- All Groups
- All Contacts
- Public Folders
- Default Global Address List
Set-AddressList "All Users" -IncludedRecipients MailboxUsers
