dial up/email retrieval OUTLOOK XP

SET UP DIAL UP FOR MAIL RETRIEVAL FROM EXCHANGE5.5
OUTLOOK.XP..MAIL IS SET UP USING OST..TO
DISCONNECT AFTER MESSAGES HAVE BEEN DELIVERED TO LAPTOP..AFTER SEND RECIEVE IS COMPLETE AND CONNECTION IS SERVERED DIALOG BOX KEEPS APPEARING
REQUESTING CONNECTION TO SERVER WITH IP ADDRESS INDICATED..TRIED QUITE A FEW THINGS ..NEED HELP