Microsoft has released an add-in that allows to create your own Microsoft Reader eBooks in Microsoft Word 2000/XP/2003
With the Word 2000/XP/2003 Add-in: Read in Microsoft Reader (RMR) 1.1.3, you can use Microsoft Word 2000, Microsoft Word XP, or Microsoft Word 2003 to create your own Microsoft Reader eBooks. Microsoft Reader makes on-screen reading more like reading a printed book, while adding active reading capabilities, instant access to content, and storage of a personal library. You can use this add-in to convert new or existing Word documents, letting you benefit from the features and convenience of Microsoft Reader.Word 2000/XP/2003 Add-In: Read in Microsoft Reader 1.1.3
Note In order to receive the full functionality of the Read in Microsoft Reader add-in, it is recommended that you install Microsoft Reader. RMR 1.1.3 is an update that enables conversion support for Word 2003. To learn more about Microsoft Reader, visit the Microsoft Reader Web site.