[Tickets #10726] Exchange 2003 IMAP error: Specified character set not supported.

[bugs at horde.org]

BITTE NICHT AUF DIESE NACHRICHT ANTWORTEN. NACHRICHTEN AN DIESE  
E-MAIL-ADRESSE WERDEN NICHT GELESEN.

Ticket-URL: http://bugs.horde.org/ticket/10726
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  Ticket           | 10726
  Erstellt Von     | h.wahl at ifw-dresden.de
  Zusammenfassung  | Exchange 2003  IMAP error: Specified character set not
                   | supported.
  Warteschlange    | IMP
  Version          | 5.0.14
  Typ              | Enhancement
  Status           | New
  Priorität        | 2. Medium
  Milestone        |
  Patch            |
  Zuständige       |
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h.wahl at ifw-dresden.de (2011-11-09 11:33) hat geschrieben:

Hello,
I am writing her because after some days of searching I did not find a  
solution.
I am switching from Horde3/IMP4 to Horde4/IMP5. Transistion worked  
mostly great, only problem is that IMP5 (5.0.14) is not able to  
connect to an Exchange 2003 server via IMAP but was no problem with  
IMP4. When logging in, the folders get displayed on the left side of  
the window but no content is shown. Instead of content there is an  
error message claiming "Mailbox listing failed IMAP error: Specified  
character set not supported."
The old working servers.php has this entry:

$servers['exchange1'] = array(
     'name' => 'Exchange',
     'server' => 'exchange.ifw-dresden.de',
     'hordeauth' => false,
     'protocol' => 'imap/ssl/novalidate-cert',
     'port' => 993,
     'maildomain' => 'ifw-dresden.de',
     'smtphost' => 'mail.ifw-dresden.de',
     'smtpport' => 25,
     'realm' => '',
     'preferred' => '',
     'dotfiles' => false,
     'hierarchies' => array()
);

The new non-working backends.local.php this one:

$servers['exchange1'] = array(
     // Disabled by default
     'disabled' => false,
     'name' => 'Exchange',
     'hostspec' => 'exchange.ifw-dresden.de',
     'hordeauth' => false,
     'protocol' => 'imap',
     'port' => 993,
     'secure' => 'ssl',
     'maildomain' => 'ifw-dresden.de',
     'smtphost' => 'mail.ifw-dresden.de',
     'smtpport' => 25,
     'acl' => false,
     'cache' => false,
);

The Unix Dovecot server I also connect to works without any trouble.  
Could anyone help out?
Thank you and best regards

Henri Wahl