Microsoft Compatible Spelling Checker - Version 1.1 For people who use following product from Microsoft: Outlook Express - E-mail program for Internet Explorer 4. Mail and News - E-mail program for Internet Explorer 3. MS Exchange - E-mail program for Microsoft Server. Window Messaging - MS Exchange update. If you use those product but does not have MS Word or office, you may miss the spell checker function. This product will enable the spelling checker function that is built in those product.