Defer until are not in the outbox but it's send the day he choses

[Christ]

Hi..
One of my user ask me this question. He is using
Outlook XP with the Defer until option. He told me wend
che click send the mail is suppose to be in the outbox
until the Defer until activate. But for him, it goes in
the send item automaticaly and the defer until option
still working

I'll look in the help files et support site and i dont
have any information on this... Is this a probleme or
it's "by desing"?