IBM Support Portal
IBM Support Portal URL for Troubleshooting Lotus Software
New URL for Lotus Technotes and Troubleshooting Documentation Only (Similar to Old Technotes Search URL)Lotus Technical Library
The Lotus library includes a wide range of technical articles, tutorials, and IBM Redbooks.
Developer Works Notes/Domino Forums on DenveloperWorks Since back in the days of Notes.Net these formus have been very helpful. Search for your problem or error and see who else is suffering through the same situation and what they may have done to fix it.
IBM Lotus Redbooks