Nokia NBU Explorer is an easy to use, free, portable application for Windows that enables you to access and back up your Nokia mobile phone contents (contacts, messages and other) to your PC.
These backup files are stored with an .nbu extension and you can read the contents of the back-up files on your PC directly.
Nokia NBU Explorer can be downloaded (89Kb) from here. For Windows XP, Microsoft.Net Framework 2 is required for running the application. [via -ghacks]