Install ESM (and same-level patching as the Exchange server) so the computer will have mapi32.dll on it and registered - make sure the mapi32.dll is the same version as Exchange (if its not, then you did not apply the correct patches). CDO.dll will typically not be installed with an ESM-only installation of Exchange, if I'm not mistaken (it can be copied from an Exchange server and registered later) - as mentioned in the previous thread, CDO.dll can be registered after-the-fact (although you may as well do it now, to be honest; you'll have to restart your BES services if done afterwards). Be sure to do the command-line MAPI configuration mentioned in the installation steps too.
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