[Evolution] Problems with 3.12.11

[rob stone]

I installed the latest version of evolution available -- 3.12.11 -- from
Debian download site.

The following errors appear in  syslog:-

Jun  6 02:54:57 roblaptop evolution.desktop[8345]: (evolution:8345):
GLib-GObject-WARNING **: The property GtkSettings:gtk-button-images is
deprecated and shouldn't be used anymore. It will be removed in a future
version.
Jun  6 02:54:57 roblaptop evolution.desktop[8345]: (evolution:8345):
GLib-GObject-WARNING **: The property GtkSettings:gtk-menu-images is
deprecated and shouldn't be used anymore. It will be removed in a future
version.
Jun  6 02:54:58 roblaptop evolution.desktop[8345]: (evolution:8345):
GLib-GObject-WARNING **: The property GtkSettings:gtk-toolbar-style is
deprecated and shouldn't be used anymore. It will be removed in a future
version.
Jun  6 02:54:58 roblaptop evolution.desktop[8345]: (evolution:8345):
GLib-GObject-WARNING **: The property GtkCellRendererPixbuf:stock-id is
deprecated and shouldn't be used anymore. It will be removed in a future
version.
Jun  6 02:55:00 roblaptop evolution.desktop[8345]: (evolution:8345):
camel-CRITICAL **: camel_session_lookup_addressbook: assertion 'name !=
NULL' failed
Jun  6 02:55:00 roblaptop evolution.desktop[8345]: (evolution:8345):
camel-WARNING **: No from set for message
Jun  6 02:55:00 roblaptop evolution.desktop[8345]: (evolution:8345):
camel-WARNING **: No content for medium, nothing to write
Jun  6 02:55:00 roblaptop evolution.desktop[8345]: (evolution:8345):
camel-WARNING **: No from set for message
Jun  6 02:55:00 roblaptop evolution.desktop[8345]: (evolution:8345):
camel-WARNING **: No content for medium, nothing to write


It also displays spurious messages in the in box with no subject or
message body and all with a date/time stamp that reflects when evolution
was started.

Clicking on send/receive brings up a dialogue box that cannot be closed.

According to the evolution web site the latest stable version is 3.16.2.
Why are the Debian packages so far behind?

I am running on:-

Linux roblaptop 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt9-3 (2015-04-23)
x86_64 GNU/Linux