If Akonadi or the computer crashes, it's very likely that the underlying MySQL database is left in a corrupt state, and Akonadi fails to start for the next time. The only solution is to delete the database, which yields a complete resync of e-mail folders, for example, that can take several hours leaving the user without e-mail access for that long.

This fragile nature of the database should be addressed. Maybe by using a more robust backend, or by somehow forcing the MySQL server to keep data in a consistent state on disk.

Reproducible: Sometimes

Steps to Reproduce:
Pull the plug from the computer (happens).
Actual Results:  
Akonadi Server Self-Test reports 'MySQL server log contains errors' when KMail is started for the next time.

Expected Results:  
It should tolerate errors like this.