Nokia NBU Backup File Explorer
All Nokia S60 users use Nokia PC Suite or the upcoming Nokia Ovi Suite Beta for managing their Nokia phones on PC.
One of the best features I like in them is the feature to create backups of our calendar and bookmarks. Nokia PC Suite creates a backup of your data in your phone and stores it as a NBU file which can’t be viewed.
NbuExplorer is a free tool that allows you to view a Nokia NBU, NFB and NFC backup file (produced by Nokia Content Copier). It is basically a NBU file parser, extractor and viewer.
It can help you to check content of backup or extract files from it. NbuExplorer requires Microsoft .NET Framwork 2.0 or later to work.
You can download this free application from here: Download NbuExplorer