[Dovecot] outlook express 6 imap client workaround

My outlook express users connecting with imap are having issues with client timeout. The wiki says to add oe6-fetch-no-newmail, but when I add that workaround I get this error in the logs:

Jun 2 10:00:13 mail dovecot: IMAP(username): Unknown client workaround: oe6-fetch-no-newmail

I'm using 1.0b7. Any ideas?