Mail routing between Microsoft Exchange and Lotus Domino 6.x and 7.x relies on SMTP. Because both products support HTML and iCal, information is displayed well and most functionality is available after routing between the two topologies.

When planning to implement interoperability between these two environments, first determine the internal route(s) between Domino and Exchange. Then, define how external e-mail addressed to your company from the Internet will route to the appropriate destination server.

The following topics discuss various options and topologies available for configuring e-mail interoperability: