RIM has updated its BlackBerry Messenger application for all BlackBerry handsets running OS version 4.5 or higher.

The new application, either available from the BlackBerry App Store or via a download link from a browser, adds a host of new features to the messenger service as well as improving old ones.

SMS text messaging gets an overhaul, avatars are now available and users will be able to send and receive large file transfers up to 6 megabytes for pictures, files and audio. 

There is also enhanced group functionality that allows users to update, share and communicate with a subset community.

Finally, RIM has added bar-code identity allowing users to add contacts to the BlackBerry Messenger contact list by displaying a 2-dimensional bar code that invitees can capture with their device cameras.

BlackBerry users can grab it now.