[Dovecot] Outlook can't download messages with no subject and empty body

[Bob]

My Outlook POP3 clients can't download messages that have empty subjects
and bodies. I'm running 0.99.11-1.1.fc2 and have added the following
line to dovecot.conf

client_workarounds = outlook-pop3-no-nuls

This didn't help. 

Any help would be appreciated,

Bob