The OD Confluence Importer will not import Workbox notifications from a pre Confluence 5.2 dataset

See the commented out test in the code ( for a good illustration of the bug see it.com.atlassian.ondemand.confluenceimporter.ConfluenceImporterTest -

    public void testWorkdayImport() throws Exception
    {
        ImportData importData = WorkdayImportData.INSTANCE;
        runImportAndVerify(importData);
    }

Basically notifications in the export will not be imported.