I also let the recent kdepim update through and it has caused a lot of problems, some of which I don't see addressed in the various posts and replies here. The two biggest issues are these:

Kmail keeps detecting mail on my ISP pop servers as new mail and re-downloading it so I end up with up to four copies of each message - then, it seems to figure something out and stops after 4 (I retrieve mail from multiple computers and only one is set to actually delete mail from the mail server and then only after 7 days - this allows various machines I work from to retrieve messages, even if one is turned off for a few days - this has worked well for years for me, but this is why it's also able to retrieve the same message multiple times)

My Kmail filters work, but not consistently - usually upon downloading a batch of messages for the second time, it leaves everything in the inbox (if I highlight them all and use Ctl+j it applies the filters and the messages all get sorted in to their respective folders)

I did revert Kdepim to ver kdepim-4.4.6-2.fc13.x86_64 Is this right, and should akonadi and kdepimlibs be at ver akonadi-1.4.0-0.2.fc13.x86_64 and kdepimlibs-akonadi-4.5.1-0.1.fc13.x86_64 ?

I've some issues in the past, usually with new installs, where the database of downloaded messages would seem to get confused and Kmail would start downloading messages over and over, but this would generally clear up after a few days. Can anyone suggest a way to fix this?