Migrating Pop3 Connector SBS 2003 to SBS 2008

After a migration of SBS 2003 to SBS 2008 i encountered some problems assigning a pop3 connect mailbox to an exchange user.
No (migrated )mail enabled users appeared in the drop down list.

Only new user who are created with the Windows SBS Console seem to populate the list.
One way to populate the list is changing the msSBSCreationState attribute on the user.
Just open adsiedit.msc and browse to the users you want to populate the list and click preferences.
Then go down to the msSBSCreationState attribute and click edit and fill in the value “Created”

Ok out of all windows and open up the pop3 connector console again.
You can now see the edited account(s) in the dropdownlist