Microsoft released a software add-on Monday for the 2003 and 2002 versions of Outlook that allows the e-mail clients to work with a server running IBM's Lotus Domino software. The Notes Connector is available now for free download. It works with versions 5 and 6 of Domino and allows Outlook to retrieve messages, calendar items, address book entries and to-do lists stored on the server.
News source: C|net News.com