I tried calling several times.  They told me that since the 8879-C is not EF ready, the returns have to be paper filed.  How's that for support?  I tried explaining that the 8879 does not get filed, it is a signature form that the preparer keeps for their records, but it was like talking to a wall. Please post if you get a resolution.  The next update to the form is in May, after the due date.