I am creating a form in Outlook which contains a combo box. I know that I can type the values I want in the combo box by specifying the "Possible Values" - but is there a way I can link this to an external source - eg a list or named range in an Excel workbook? My problem is that the list is quite lengthy and changes regularly, so it would be better if I could just maintain one data source rather than having to edit the list in the Outlook form each time. Any help would be most gratefully received. Thanks.