On Wed, 23 Mar 2016, 12:26 Misha Shnurapet, <misha@gnome.org> wrote:
That is what confuses me. It looks like the desktop depends on a
component of Evolution. What is it going to look like when the GNOME's
own mail app comes around?

gnome-shell and Calendar use the calendar component of e-d-s, Contacts the address book. So even if the hypothetical GNOME Mail app ends up not using e-d-s, this wouldn't have any effect on the other apps/components.