Microsoft is preparing to launch an <A HREF="http://news.com.com/2100-1032_3-5055448.html">enhanced version of its MSN service</A> this fall as part of its efforts to tap broadband users for online subscriptions. According to News.com, the service is tentatively called MSN Premium, and will be an add-on for existing phone or cable broadband users. The service also will connect MSN's email and calendar with Microsoft's Outlook email management system, essentially acting as a bridge between MSN and Office, using Exchange as its backend.