Hello, Last days i was blocked by akonadi-12-1-1 and kmail out of service. I tried to modify the schematic layout of the base Akonadi Mysql to correct the error that akonadi-server meeting as indicates it the message of Markus Meier, not being a specialist Mysql, I looked on Google and found which to have "FOREIGN KEY" in Mysql it was necessary that the concerned table have an engine InnoDB, I converted a table Myisam in InnoDB, but the same error occurs farther on another table, then I converted all the tables Myisam in InnoDB, unfortunately an error occurs farther and i did not find solution.I then decided as advised me somebody to protect the base(basis) akonadi and to delete it, with the re-creation of the akonadi base I was able to found the use of Kmail. All the modifications introduced by akonadi-server 12-1-1 are optimizations at the level of the plan of the base(basis), I think that a specialist Mysql should deal with the modifications to be brought to allow a transition of 11-> 12 which is made without error. Best Regards. Philippe Merlin
