KOrganizer Data Migration
Problem description
If your client was updated from Debian Squeeze (6.0) to Debian Wheezy (7.1) and all your KOrganizer events disappeared after the migration, or if you are a new KOrganizer user and you cannot get KOrganizer to work (e.g. KOrganizer notifies you about being unable to store a new event or about being unable to read the calendar file), you should read the following instructions.
Steps to a working KOrganizer
Cleanup your KDE profile. CAUTION: backup all files to be removed, as you might loose application settings and -data if you were already using KDE applications before. You might skip this step and try to start with the next step, it might work too. If it doesn't, you should try the cleanup described here:
/usr/bin/akonadictl stop rm -rf $HOME/.kde/share/config/akonadi* rm -rf $HOME/.kde/share/config/kresources rm -rf $HOME/.local/share/akonadi rm -rf $HOME/.config/akonadi
Run /usr/bin/systemsettings (the KDE control panel), Click the icon Personal Information, then choose "Calendar" in the dropdown box. Click the button [Add...].