Version:            (using KDE 4.3.2)
Installed from:    Fedora RPMs

It would be hugely advantageous for a business environment to have a feature whereby all email (both sent and received) is archived in a database and accessible for retrieval.  It is possible currently to save individual mails but this is very cumbersome.  Email archival should be transparent...it should be possible to set it up in a few clicks, and have it possible for both local (per user) or global (system wide) archiving.  In the United States (and possibly other countries) this archival is required for many businesses -- not having a system for easy mail retrieval may mean Kontact/Kmail is less widely adopted.

It would be hugely helpful if all associated data (such as threads, replied-to data, importance, etc.) could be included.  

It would not be necessary to restore email into Kontact, though this would be an even better feature, as it could be used to back up Kmail/Kontact as well.  

The key thing is that this should be relatively end-user friendly, perhaps with a Wizard to walk one through the initial setup steps...and then a one click "Enable Archiving" option in the Preferences.  

I am not a programmer but would be happy to assist in any way possible (including writing documentation) if it helps.