Comment # 5 on bug 1200860 from Misso Works

Thank you a lot for guidance, I have opted for recreating the database from
scratch and KMail can now start and is currently resyncing the data. I am
pleasantly surprised to see that account configuration has not been deleted.
However this issue should really be investigated in my opinion. Data corruption
shouldn't happen randomly after a upgrade. 

I've heard such reports about akonadi data corruption when I was shopping
around for a new email client, but I assumed the problem was old so I was
pleasantly surprised to see that everything seemed stable. We are considering
relying on the KDE PIM framework and its ecosystem of applications for our
workstations as this perspective looks very attractive, but if the database is
so fragile, then this is a real problem...