Crash when syncing with Exchange

[HdV@xxxxxxxxxxxxxx]

Hi,

I have been using offlineimap for a couple of weeks now to sync lots of
mailboxes on *nix hosts, most of them running UW-IMAP daemons. This has
been working without any flaw. However a couple of days ago I needed to
add an account on a Exchange Server to the list. That proved to be a
disaster as offlineimap constistenly crashes immediately after the
authentication phase. Below you'll find the debugging output (it was not
sent to the given file, but to STDOUT/STDERR). I can't see what's
causing this and Google couldn't help me either. I see an error about a
string index, but don't know to which string it points. Can anyone give
me some hints? I am inclined to think this is not a configuration error
since it still happens when I remove all the fancy stuff. Here's what I
am using right now:

===========================
[Account ka]

localrepository = ka_local
remoterepository = ka_remote

[Repository ka_local]

type = Maildir
localfolders = ~/Mail/ka
sep = .

[Repository ka_remote]

type = IMAP
remotehost = w.x.y.z
ssl = no
remoteuser = username
reference =
maxconnections = 1
holdconnectionopen = no
===========================

All help is appreciated.
Thanks in advance.

$ offlineimap -d imap -l ~/offlineimap.log

Thread 'Account sync ka' terminated with exception:
Traceback (most recent call last):
  File "/usr/lib/python2.2/site-packages/offlineimap/threadutil.py", line 153, 
in run
    Thread.run(self)
  File "/usr/lib/python2.2/threading.py", line 402, in run
    apply(self.__target, self.__args, self.__kwargs)
  File "/usr/lib/python2.2/site-packages/offlineimap/accounts.py", line 112, in 
syncrunner
    self.sync()
  File "/usr/lib/python2.2/site-packages/offlineimap/accounts.py", line 132, in 
sync
    remoterepos.syncfoldersto(localrepos)
  File "/usr/lib/python2.2/site-packages/offlineimap/repository/Base.py", line 
104, in syncfoldersto
    srcfolders = src.getfolders()
  File "/usr/lib/python2.2/site-packages/offlineimap/repository/IMAP.py", line 
135, in getfolders
    imapobj = self.imapserver.acquireconnection()
  File "/usr/lib/python2.2/site-packages/offlineimap/imapserver.py", line 188, 
in acquireconnection
    listres = imapobj.list(self.reference, '""')[1]
  File "/usr/lib/python2.2/site-packages/offlineimap/imaplib.py", line 465, in 
list
    typ, dat = self._simple_command(name, directory, pattern)
  File "/usr/lib/python2.2/site-packages/offlineimap/imaplib.py", line 976, in 
_simple_command
    return self._command_complete(name, apply(self._command, (name,) + args))
  File "/usr/lib/python2.2/site-packages/offlineimap/imaplib.py", line 750, in 
_command
    data = '%s %s' % (data, self._checkquote(arg))
  File "/usr/lib/python2.2/site-packages/offlineimap/imaplib.py", line 959, in 
_checkquote
    if (arg[0],arg[-1]) in (('(',')'),('"','"')):
IndexError: string index out of range


Last 17 debug messages logged for Account sync ka prior to exception:
maildir: MaildirRepository initialized, sep is '.'
imap:   54:09.64 imaplib version 2.52
imap:   54:09.64 new IMAP4 connection, tag=FODD
imap:   54:09.65 < * OK Microsoft Exchange IMAP4rev1 server version 5.5.2654.50
(dto0nt10.dto.tudelft.nl) ready
imap:   54:09.65        matched r'\* (?P<type>[A-Z-]+)( (?P<data>.*))?' => 
('OK', ' Microsoft Exchange IMAP4rev1 server version 5.5.2654.50 
(dto0nt10.dto.tudelft.nl) ready', 'Microsoft Exchange IMAP4rev1 server version 
5.5.2654.50 (dto0nt10.dto.tudelft.nl) ready')
imap:   54:09.65 untagged_responses[OK] 0 += ["Microsoft Exchange IMAP4rev1 
server version 5.5.2654.50 (dto0nt10.dto.tudelft.nl) ready"]
imap:   54:09.65 > FODD0 CAPABILITY
imap:   54:09.65 < * CAPABILITY IMAP4 IMAP4rev1 IDLE LITERAL+ LOGIN-REFERRALS 
MAILBOX-REFERRALS NAMESPACE AUTH=NTLM
imap:   54:09.65        matched r'\* (?P<type>[A-Z-]+)( (?P<data>.*))?' => 
('CAPABILITY', ' IMAP4 IMAP4rev1 IDLE LITERAL+ LOGIN-REFERRALS 
MAILBOX-REFERRALS NAMESPACE AUTH=NTLM', 'IMAP4 IMAP4rev1 IDLE LITERAL+ 
LOGIN-REFERRALS MAILBOX-REFERRALS NAMESPACE AUTH=NTLM')
imap:   54:09.65 untagged_responses[CAPABILITY] 0 += ["IMAP4 IMAP4rev1 IDLE 
LITERAL+ LOGIN-REFERRALS MAILBOX-REFERRALS NAMESPACE AUTH=NTLM"]
imap:   54:09.65 < FODD0 OK CAPABILITY completed.
imap:   54:09.65        matched r'(?P<tag>FODD\d+) (?P<type>[A-Z]+) 
(?P<data>.*)' => ('FODD0', 'OK', 'CAPABILITY completed.')
imap:   54:09.65 CAPABILITIES: ('IMAP4', 'IMAP4REV1', 'IDLE', 'LITERAL+', 
'LOGIN-REFERRALS', 'MAILBOX-REFERRALS', 'NAMESPACE', 'AUTH=NTLM')
imap: Attempting plain authentication
imap:   54:17.49 > FODD1 LOGIN username "password"
imap:   54:17.66 < FODD1 OK LOGIN completed.
imap:   54:17.66        matched r'(?P<tag>FODD\d+) (?P<type>[A-Z]+) 
(?P<data>.*)' => ('FODD1', 'OK', 'LOGIN completed.')