I am using dovecot 2.0.9 on CentOS 6.2. I have created Public folder successfully but I am not able to write in it through Outlook or through SquirrelMail. Configuration I have done is:

# dovecot -n
# 2.0.9: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-220.7.1.el6.i686 i686 CentOS release 6.2 (Final)
auth_debug = yes
auth_debug_passwords = yes
auth_mechanisms = plain login
auth_username_format = %Lu
auth_verbose = yes
disable_plaintext_auth = no
log_path = /var/log/dovecot.log
mail_debug = yes
mail_location = maildir:~/Maildir
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date
mbox_write_locks = fcntl
namespace {
inbox = yes
location =
prefix =
separator = /
type = private
}
namespace {
list = children
location = maildir:%%h/Maildir:INDEX=~/Maildir/shared/%%u
prefix = shared/%%u/
separator = /
subscriptions = no
type = shared
}
namespace {
list = children
location = maildir:/home/vmail/public:INDEX=~/Maildir/public
prefix = Public/
separator = /
subscriptions = no
type = public
}
passdb {
args = /etc/dovecot/dovecot-ldap.conf
driver = ldap
}
plugin {
acl = vfile
acl_anyone = allow
acl_shared_dict = file:/var/lib/dovecot/shared-mailboxes
}
service auth {
unix_listener /var/spool/postfix/private/auth {
group = postfix
mode = 0666
user = postfix
}
}
ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
ssl_key = </etc/pki/dovecot/private/dovecot.pem
userdb {
args = uid=502 gid=502 home=/home/vmail/%u
driver = static
}
verbose_proctitle = yes
protocol imap {
mail_plugins = acl imap_acl
}
protocol pop3 {
pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
pop3_uidl_format = %08Xu%08Xv
}

# ls -ls /home/vmail
total 24
4 drwxr-xr-x 3 vmail vmail 4096 Mar 24 16:58 ccc
0 -rw-rw---- 1 vmail vmail 0 Mar 24 18:36 dovecot-acl
0 -rw-r-Sr-- 1 vmail vmail 0 Mar 24 19:58 dovecot-shared
4 drwxr-xr-x 3 vmail vmail 4096 Mar 24 16:58 kkk
4 drwxr-xr-x 3 vmail vmail 4096 Mar 24 16:53 pappaninani
4 drwxr-xr-x 7 vmail vmail 4096 Mar 25 12:44 public
4 drwx--S--- 3 vmail vmail 4096 Mar 25 12:19 rrr
4 drwxr-xr-x 3 vmail vmail 4096 Mar 24 16:57 vvv

#ls -las /home/vmail/public
total 28
4 drwxr-xr-x 7 vmail vmail 4096 Mar 25 12:44 .
4 drwxr-sr-x 8 vmail vmail 4096 Mar 25 12:19 ..
4 drwxr-sr-x 2 vmail vmail 4096 Mar 24 19:48 .bugtraq
4 d-wx--s--x 2 vmail vmail 4096 Mar 24 19:47 cur
0 -rw-r--r-- 1 vmail vmail 0 Mar 25 12:33 dovecot-acl-list
0 -rw-r-Sr-- 1 vmail vmail 0 Mar 25 12:44 dovecot-shared
4 drwxr-sr-x 2 vmail vmail 4096 Mar 24 19:48 .lkml
4 d-wx--s--x 2 vmail vmail 4096 Mar 24 19:47 new
4 d-wx--s--x 2 vmail vmail 4096 Mar 24 19:47 tmp

Please help and thanks in advance.