[Dovecot] Thunderbird doesn't popup on new mail

[Adrian Stoica]

I have a question : i've upgrade dovecot from 1.1.4 to 2.0.9 and 
everything is fine except thunderbird clients , that no longer show a 
popup when new mail arrives. Anyone know why ?

doveconf -n:
# 2.0.9: /usr/dovecot2/etc/dovecot/dovecot.conf
# OS: Linux 2.6.35.4 i686
auth_cache_negative_ttl = 10 secs
auth_cache_size = 10 M
auth_cache_ttl = 1 mins
auth_mechanisms = plain login cram-md5
auth_socket_path = /var/run/dovecot/auth-userdb
auth_verbose_passwords = plain
base_dir = /var/run/dovecot/
default_client_limit = 5000
default_internal_user = vmail
default_login_user = nobody
default_process_limit = 200
deliver_log_format = mail from=%f subject=%s msgid=%m: %$
dict {
   acl = mysql:/usr/dovecot2/etc/dovecot/dovecot-dict-sql.conf.ext
}
disable_plaintext_auth = no
first_valid_uid = 1
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
listen = *
mail_location = maildir:~/Maildir
mail_plugins = " quota acl trash notify mail_log"
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
namespace {
   inbox = yes
   location =
   prefix =
   separator = /
   subscriptions = yes
   type = private
}
namespace {
   hidden = no
   list = children
   location = maildir:%%h/Maildir:INDEX=~/Maildir/shared/%%u
   prefix = shared/%%u/
   separator = /
   subscriptions = no
   type = shared
}
passdb {
   args = /usr/dovecot2/etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
plugin {
   acl = vfile
   acl_shared_dict = proxy::acl
   autocreate = Trash
   autocreate2 = Drafts
   autocreate3 = Sent
   autosubscribe = Trash
   autosubscribe2 = Drafts
   autosubscribe3 = INBOX
   autosubscribe4 = Sent
   mail_log_events = delete mailbox_delete mailbox_rename
   mail_log_group_events = yes
   quota = maildir:User quota
   quota_warning = storage=95%% quota-warning 95 %u
   quota_warning2 = storage=95%% quota-warning 90 %u
   quota_warning3 = storage=85%% quota-warning 85 %u
   sieve = ~/.dovecot.sieve
   sieve_dir = ~/sieve
   trash = /usr/dovecot2/etc/dovecot/dovecot-trash.conf.ext
}
postmaster_address = postmaster at dacris.net
protocols = imap
rejection_subject = Rejected: %s: %r
service auth {
   unix_listener auth-userdb {
     mode = 0660
     user = vmail
   }
}
service dict {
   unix_listener dict {
     user = vmail
   }
}
service imap-login {
   process_min_avail = 16
   service_count = 1
}
service imap {
   process_limit = 2048
   vsz_limit = 512 M
}
service quota-warning {
   executable = script /bin/quota_warning.sh
   unix_listener quota-warning {
     user = vmail
   }
   user = vmail
}
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem
userdb {
   args = /usr/dovecot2/etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
protocol lda {
   mail_plugins = " quota acl trash notify mail_log sieve autocreate"
}
protocol imap {
   mail_plugins = " quota acl trash notify mail_log imap_quota imap_acl"
}
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