Today I've downloaded the latest KDE Daily Build. This includes the 4.10.1 version of KDE.
I started to test with USB-Live stick and probed serveral topics with it.
So, also launching KOrganizer, which uses Akonadi (Server).
To cut a longshort story: KOrganizer and Akonadi-Server work out of the box. No need to change standard settings.
I could launch KOrganizer, then add a calendar (here my Google) and after login in Google account, I could choose my favourite calendars to show in KOrganizer.
I think, there was a mismatch while migrate from KDE 4.9.5 to 4.10.0 and 4.10.1.
So, my conclusion is: If possible, do a clean new (re)install with at least that Daily Build from 10/03/2013,
then most problems and much upgrade work and time are not necessary do be done.
Tomorrow then, I will install that new Daily Build on my notebook. Scratch my KDE 4.9.5 system and after formatting, install SL again. In my last Backup I have all settings and files from my home directory. So I can recreate my home step by step ...
Thank you all for caring this akonadi topic here, guys. I will close this topic now.
-Linuxfluesterer (I love KDE ...)