User creates a private group, for example 5 people in customer service. Calls the group CS. Contains Tom, Dick, Harry, Mary and Jane. Prior to FP8 she sends email out to CS and the To: got expanded to all the recipients. A recipient could to a "reply to all" and continue the conversation. Upon installation of FP8 it no longer expands the group. One of the recipients tries to do a 'reply to all' and gets an invalid address for CS.
APAR LO92034 with SPR JMEAAL7J7V
Service Request 53181,082,000
According to IBM they will: "be creating an enhancement request for this issue so that the developers can review this for possible fix in future releases."