……..The Nokia E90 Communicator is the latest addition to the set of contemporary high-performance devices for executives. We had to wait three years since the last Nokia 9500 Communicator appeared. Our patience was duly rewarded at the 2007 3GSM Congress, when Nokia unveiled the ultimate no-compromise mobile communication device. It remains faithful to some of the family traditions, others it forsakes, but the outcome is downright worth it. Nokia E90 has the familiar body construction: a hefty handset, which opens up to reveal a wide landscape display.

Before the E90 appeared, communicators used to be a class on its own in the Nokia portfolio. They had their own UI, which brought forth a number of issues. Above all, every application had to be adapted to the uncommon S80 UI. Quite unaffordable and therefore rare, communicators were ostracized by software developers. That’s exactly the flaw, which has been addressed in the new Nokia E90. The phone features a standard Symbian 9.2 and 3rd edition S60, working on a giant display and ensuring far greater compatibility.

In closed position E90 looks like a traditional, though well oversized, Nokia bar. For the lack of a better reference point for size and weight, we compare it against the older Nokia 9500. The newer release has notably reduced size and still packs in near full contemporary functionality. The table below compares the essential features of the last two Communicator generations.

Size is the first thing you’ll have to put up with about the Nokia E90. And it may as well be the last. What you get is unmatched keypad space and display size.
(source of this article http://www.gsmarena.com/nokia_e90-review-164.php)