This is worth watching:
http://www.lotus.com/world/usa.nsf/framedyn?OpenForm&/world/usa.nsf/allpublic/4BEE565CE342FFC485256A920057D2B1
Summary:
Integrating Microsoft SQL Server with Lotus Domino
Lotus 24 x 7 Webcast
This webcast shows how you can embrace and extend your existing investment in Microsoft technologies with Lotus Domino. George Brichacek describes how you can integrate Microsoft's SQL Server with a Domino Server. He takes a look at the enterprise integration architecture and specifically examines DECS (Domino Enterprise Connection Service). Demos are included to show how to establish connectivity between servers, to illustrate the setup process, and to show an actual application working. This session describes how to take advantage of the benefits of a Domino Server while utilizing an existing SQL Server.