Just a mental note to self. Don’t try to use the embedded Sametime client in Notes 6.5.1 against a Domino/Sametime 7 server. It does not work. Upgrading the client to Notes 6.5.5 solved the problem.
Error message was the well-known “Incorrect password” (0x8000003).
It works lotus notes 6.5.3 also try it