I have configured Postfix on REDHAT Linux 9

everything is working fine while i enable mail box location to /ver/spool/mail in main.cf file

if changed from /var/spool/mail box to /Maildir is't no ok in client side . i mean client program [eg.,outlook,pegasus,etcc]can not get mail from server.but local system delivered mail to user's home directory

pop3 services is running fine .because the same setup is working fine when /var/spool/mail box is enabled

what i have to do...?