(Just short, a long version of this tech tipp will come soon.)
If your KDE Kontact Groupware Client is suddenly missing IMAP Addressbooks, other GW ressources and dialogues, then add the line "TheIMAPResourceAccount=" to the [Imap Ressource] Section of the file kmailrc in ~/.kde/share/config. Enter the Identifier of your IMAP Storage behind the "=", you’ll find it in the same section. Here comes an example from my files:
The Developer Team knows about this bug, and they are working on it – I guess.
Here you’ll find the bugreport. Sadly, I found out that this applies to Suse, Ubuntu and other Linux versions since late 2007.