How to create new folder in Outlook 2003 (C#) ?
It's pretty simple:
Application outlookApp = new Application ();
NameSpace ns = outlookApp.GetNamespace ("MAPI");
// Our new folder will be in this base folder (default inbox folder)
MAPIFolder baseFolder = ns.GetDefaultFolder (OlDefaultFolders.olFolderInbox);
// Create the new inbox folder with name "My New Folder" in base folder
MAPIFolder myNewFolder = baseFolder.Folders.Add ("My New Folder", OlDefaultFolders.olFolderInbox);