Recently I encountered a situation where Outlook Express was giving me a similar error, although it was only on certain emails. It started when I tried to tell Outlook Express to synchronize less than 'All messages' and I must have used 'New headers' or something instead. Switching it back to 'All messages' made it continue to download the entire body + headers of new mail, but they were accessible. For the messages that were inaccessible, to regain access I had to select them, right click the selection, click "Move to Folder", and select the Inbox under the same mail server, then Click "Send/Recv" and the fixed messages would appear.
Alessio Cecchi wrote:
Hi,

in some installation where users using IMAP and Outlook Express I have some problems.

Outolook randomly presents problems in messages retrieving, for example:

"Outlook Express is unable to retrieve the requested message because the server no longer has the message available.... server response: Fecth Completed"

or

"Message could not be displayed" error message when I try to view an Outlook Express e-mail message

I'm using dovecot 1.1.4 with qmail and vpopmail.

This is my dovecot configure options:

./configure --prefix=/usr --sysconfdir=/etc/dovecot --localstatedir=/var 
--with-ssldir=/etc/ssl

and this my dovecot config:

# dovecot -n
# 1.1.4: /etc/dovecot/dovecot.conf
log_path: /var/log/dovecot/dovecot-err.log
info_log_path: /var/log/dovecot/dovecot.log
ssl_cert_file: /etc/apache2/ssl/comun.crt
ssl_key_file: /etc/apache2/ssl/comun.key
disable_plaintext_auth: no
login_dir: /var/run/dovecot/login
login_executable: /usr/libexec/dovecot/imap-login
login_greeting: Ready
login_process_per_connection: no
first_valid_uid: 89
last_valid_uid: 89
first_valid_gid: 89
last_valid_gid: 89
mail_uid: 89
mail_gid: 89
mail_location: maildir:~/Maildir
mail_debug: yes
mail_plugins: quota imap_quota
imap_client_workarounds: outlook-idle delay-newmail
namespace:
  type: private
  separator: .
  prefix: INBOX.
  inbox: yes
  list: yes
  subscriptions: yes
auth default:
  verbose: yes
  debug: yes
  passdb:
    driver: checkpassword
    args: /home/vpopmail/bin/vchkpw
  userdb:
    driver: prefetch
    args: uid=89 gid=89 home=/home/vpopmail/domains/%d/%u
plugin:
  quota: maildir

What further changes to the configuration of dovecot could I do?
        
Do you have other suggestions?

Thanks

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