OUTLOOK 2000 “i” MESSAGE

OCCASIONALY, WHEN ATTEMPTING TO OPEN AN ATTACHMENT IN AN EMAIL USING OUTLOOK 2K A BANNER “i” MESSAGE STATES THAT OUTLOOK HAS DETERMINED THAT THEATTACHMENT IS POTENTIALLY DANGEROUS AND WILL NOT OPEN THE ATTACHED FILES. TWO FILES IN QUESTION WERE ACCESS 2K .MDB FILES. HOW CAN OUTLOOK BE CHANGED TO ALLOW THESE FILES TO BE OPENED?