You have to make sure that under the e-mail tab for preferences the override extended MAPI has to be checked. Then of course under system defaults both integration boxes need to be checked and the setting have to point to the correct database (which you have alread done). And I'm sure you know this but of course both applications have to be open (Outlook and Max). Hope this helps! If not I will see if I can think of anything else.
Thanks,
MaxAdmin