REplace the line
RDOFolder folder = Store.RootFolder.Folders.Add("Opportunities",
"IPM.Task.ArtistsOrganizer.BO");
with
RDOFolder folder = Store.IPMRootFolder.Folders.Add("Opportunities",
"IPM.Task.ArtistsOrganizer.BO");

Note that root folder of any store is not visible - Outlook creates
invisible and search folders there.
What you need is the root IPM folder (which is a subfolder of the root
folder).
You can look at the folders in OutlookSpy - click IMsgStore button in the
OutlookSpy toolbar, then click "Open Root Container" and go to the
GetHierarchyTable tab.

--
Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool
-
"escamoteur" wrote in message
...
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");