"Like most of GNOME, Evolution has a minimalist
industrial look. It consists of five modules: email, contacts,
calendars, tasks, and memos. None of these modules looks as though
it were designed with much reference to the others, although
sharing information between them is reasonably straightforward.
"By contrast, Kontact still retains much of the informal look of
KDE 4. In addition to the modules found in Evolution (some
differently named), it includes modules for RSS feeds, popup notes,
and tracking the time to do each task. All its modules have their
own names and can be run without Kontact, but go mostly unnamed
within it. The design throughout all the Kontact applications is
more consistent than in Evolution's, which reflects the greater
unity of appearance in KDE than in GNOME. In addition, because all
the applications depend on KDE's PIM engine Akonadi, they tend to
open faster than Evolution's, too.
"One useful module in Kontact is Summary, which lets you see at
a glance what new messages you have, as well as upcoming events and
deadlines. However, in other places, Kontact is less user-friendly
than Evolution. In particular, settings such as email templates and
the default names of message filters are written in pseudo-code
that might intimidate inexperienced users. Nor are inexperienced
users likely to know the distinction between Ham (wanted mail) and
Spam that appears on the icons. "