Subscription Manager - Version 1.2 The Subscription Manager add-in is designed for automatic adding/deleting subscribers to/from MS Outlook 2000/XP mailing lists based on special emails from them with the commands in Subject field. SUM is capable of processing "subscribe", "unsubscribe", "confirm" and "help" requests; after processing, addin send the reply based on general and easy to customize Outlook templates. SUM support almost features of standalone list management products.