Postfix virtual - confused

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Hi all,

I'm a newbie in Linux world and , of cource, in postfix.
What I'm trying to do is making a mail server in my office network for
sending / retrieving e-mail within the network only ( simply said, for 
fun ).
My admin has allowed me doing this.
My system is debian unstable 2.4.27 kernel, postfix 2.14. I've been 
following
a guidance from http://home.eray.biz/sites/postfix/
I'm configuring postfix virtual with mysql, and courier-imap. After 
everything
has been set up, I tried to log on into the mail server with 'telnet 
server 110'.
And the authentication passed fine. I tried to send e-mail via console 
and the
e-mail was recieved successfully, some virused e-mail has been 
identified and
treated well by amavisd-new. I thought everything's fine untill I set up my
mail account in a windblows box with outlook.
Everything's fine, except that the sample e-mails that have been sent 
previously
into the account is not shown in outlook.
It looks like postfix still assume that users' mail is in /var/mail 
directory not in the
/var/mail/virtual ( my virtual mailbox base ).
How can I fix this ?

Thank you very much for your help. And I'm sorry for this long mail.

Below is the output of postconf -n :

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = smtp-amavis:[127.0.0.1]:10024
daemon_directory = /usr/lib/postfix
debug_peer_level = 2
delay_warning_time = 4
home_mailbox = Maildir/
inet_interfaces = all
mail_owner = postfix
mail_spool_directory = /var/spool/mail
mailbox_command = /usr/bin/procmail -Y -a $DOMAIN
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
mydestination = $myhostname
mydomain = intraceres.net
myhostname = welly.intraceres.net
mynetworks = 127.0.0.1/8, 172.16.1.0/24
myorigin = /etc/mailname
newaliases_path = /usr/bin/newaliases
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix
sample_directory = /usr/share/doc/postfix-doc/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop
smtpd_recipient_restrictions = reject_non_fqdn_recipient, 
permit_mynetworks, check_client_access 
hash:/var/lib/opo-before-smtp/hosts, reject_unauth_destination, 
check_relay_domains
smtpd_sender_restrictions = reject_non_fqdn_sender, 
reject_unknown_sender_domain
unknown_local_recipient_reject_code = 450
virtual_alias_maps = mysql:/etc/postfix/mysql_alias.cf
virtual_gid_maps = mysql:/etc/postfix/mysql_gid.cf
virtual_mailbox_base = /var/mail/virtual
virtual_mailbox_domains = mysql:/etc/postfix/mysql_domains.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql_mailbox.cf
virtual_uid_maps = mysql:/etc/postfix/mysql_uid.cf

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