My 2013 installation is much simpler, so I cannot speak from personal
experience, however Paul Cunningham can:
http://exchangeserverpro.com/exchange-2013-installing-cumulative-updates/
down in the comments you will see
Jeff Brown says
January 23, 2015 at 3:08
Question for the group.
I have a customer that is going to be installing Exchange 2013 CU13 soon.
We're getting together documents and creating checksheets for the update.
The customer insists that CU's get installed from "the outside in", meaning
from the Edge Server towards the mailbox
