[Dovecot] what exactly does outlook-idle workaround?

Hi,

Can anyone tell me what the 'client_workarounds = outlook-idle' directive exactly does? I have enabled it in my /etc/dovecot.conf, but the problem that I think it should solve still exsits. That is that after being IDLE for more than half an hour Dovecot will disconnect Outlook but Outlook never connects back. Therefore users receive new mail, but they don't get notified unless they press send/receive.

So what does the workaround do? And how can I solve the problem?

Thanks! Jonathan