Just curious -- what happens if after the install, you do:
cd \Program Files\Common Files\system\MSMAPI\1033
regsvr32 /u /s LSMSSP32.dll
regsvr32 /u /s SharingAddin.dll
regsvr32 /u /s ShutdownAddin.dll
regsvr32 /s LSMSSP32.dll
regsvr32 /s SharingAddin.dll
regsvr32 /s ShutdownAddin.dll |