I tried this here. The Store is created, fine, but the folder is not created although the returned RDOFolder is not null

I use Outlook 2007

RDOSession Session = new RDOSessionClass();// CreateObject("Redemption.RDOSession");
//Use the MAPI session from Outlook Object Model
Session.MAPIOBJECT = theApp.Instance.Application.Session.MAPIOBJECT;
RDOStore Store = (RDOStore) Session.Stores.AddPSTStore(path, 2, "ArtistsOrganizer");
RDOFolder folder = Store.RootFolder.Folders.Add("Opportunities", "IPM.Task.ArtistsOrganizer.BO");