private void ThisAddIn_Startup(object sender, EventArgs e) { var folder = Application.Session.GetDefaultFolder(OlDefaultFolders.olFolderInbox); var storage = folder.GetStorage(CategorizerDataStore, OlStorageIdentifierType.olIdentifyBySubject); // initialize topic persister with StorageItem var configPersister = new OutlookPstConfigPersister(storage); ServiceLocator.ConfigPersister = configPersister; // initialize topic persister with StorageItem var topicPersister = new OutlookPstTopicPersister(storage); ServiceLocator.TopicPersister = topicPersister; Application.ItemSend += Application_ItemSend; }