SSO Applications working together must be in the same domain.
SSO Applications must have access to each other’s SSO verification URL.
Browsers must support cookies.
For security purposes, SSO should not be used on machines where the browser is run.
To switch to a different identity, the browser needs to be restarted.
Assuming single sign-off is enabled in both Messenger Express and for Sun Java System Calendar Server, if you log out of Sun Java System Calendar Server, then you are supposed to have to login again to Messenger Express. If you log out of Messenger Express, then you would have to login again into Sun Java System Calendar Server. However, it currently does not work this way. You may stay logged into one after logging out of another.