In KDE Software Compilation 4.4 KAddressBook became the first application to use Akonadi. There are inevitable glitches in early stages of migration, and the Troubleshooting page will help solve them. For a brief description of the purpose of Akonadi, see this Glossary entry. You will also find useful links to further reading. Once the inevitable teething troubles are over Akonadi will provide a power-house usable by many applications.
The page KAddressBook will help you get your new-style address book working smoothly with KMail.
Understanding the Structure
You can, of course, simply use Kontact to manage all your address book, but if you have a backup system in place, for instance, you'll want to know where your data is, and how it's handled. The page Akonadi and AddressBook will help.
Troubleshooting Tips and Common Problems
If you have any problems with getting Akonadi working please visit the Troubleshooting page.
For help getting address books recognised, please see KAddressBook.
If you are experiencing 100% CPU usage by the virtuoso-t process when using Akonadi and related programs from KDE PIM 4.6, you should try this proposed workaround while it is being investigated. In KRunner's configuration page, disable the Nepomuk search plugin and the Contact plugin, then log out and back in.
Disable the Nepomuk search plugin. It is suspected that this is the cause of the problem. Please report back, here, on the Forum, or on IRC #kde-www if you try it.