Well considering you installed BES on Exchange you should be fine with the version of cdo.dll, mapi32.dll.
Because you have SP1 I would advise to update emsmdb32.dll from 6.5.7226.0 to 6.5.7233.63
http://www.blackberry.com/knowledgec...?nodeid=767441
I would suggest upgrading to 4.0 SP4 HF2