Nokia Messaging offers a significantly enhanced email offering over the standard S60 5th Edition implementation in the Messaging application. The email client has been optimised for finger touch usage, including contextual 'tap and hold' functionality, support for landscape and portrait views and more. We'll take a more detailed look at Nokia Messaging on S605th Edition in due course.
Here's the Beta Labs video, which explains some of the highlights of the Nokia Messaging on the Nokia 5800 XpressMusic:
The full release of Nokia messaging for S60 5th Edition is due in May. As such the current version should be considered a beta / preview release. The installation process has not yet been finalised or streamlined (you'll need to follow the instructions carefully).
Although the feature set will not change between now and the first formal release, the Nokia Messaging team are looking for feedback to help identify bugs and other problems. Moreover they are planning future version and welcome feedback on what you would like to see in the future.