What is the purpose of Single Sign-on?

Single Sign-on is required to seemlessly interoperate between calendar, address book, and mail.

When should I use Messaging Single Sign-On?

If the Messaging Server has already been setup to use Sun Java System LDAP Schema1 without Access Manager support, enable Messaging Single Sign-On to authenticate.

To enable Single Sign-on in Communications Express using Messaging Single Sign-On, refer to the section on Setting up Messaging Single Sign-On in Chapter 4 of this guide.