Quote Originally Posted by MattKing View Post
This is subject to correction but ....

The electronic cable release won't give you a photograph using mirror lock-up on it's own - you will need a mechanical shutter release connected to the lens.

The electronic cable release is intended to be used with the camera in standard operation.

And it won't work with the "T" function.
I believe you are right except for half of the T bit. I believe that the electronic release can initiate a T exposure but (obviously) not end it because T involves a mechanical latch in the lens.