[Dovecot] dovecot vs. Outlook Mobile

Hi, I am testing dovecot with Outlook Mobile 5 (OM5), which is currently not working. OM5 connects, says "NOOP" and "CAPABILITY", does login correctly and simply loggs out after that telling the user that it could not download any messages. When I put an imapproxy[0] in front of dovecot, OM5 works perfectly well. That leads me to the thought, that something in the way dovecot sends its responses makes OM5 upset. Does anybody on this have seen this before?

Thanks, Jörg

[0] http://www.imapproxy.org

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