I had the same problem - the bug 27014: "Summary and folder mismatch, even after a sync".
In the same time I had problem with the bug 183136: "Error while Storing folder Sent".
It was very annoying.
I have solved both problems in a very simple way.
Just delete file "folders.db" from ~/.evolution/mail/local and start "evolution". In the first time the evolution needs more time to rebuild folders.db. After that, everything works fine.
I had the same problem - the bug 27014: "Summary and folder mismatch, even after a sync".
In the same time I had problem with the bug 183136: "Error while Storing folder Sent".
It was very annoying.
I have solved both problems in a very simple way.
Just delete file "folders.db" from ~/.evolution/ mail/local and start "evolution". In the first time the evolution needs more time to rebuild folders.db. After that, everything works fine.