Scheduled email stays in outbox

Clients connected live to an Exchange 5.5 Server.
On outlook 2000 or XP, if I schedule a email to be sent later on ("do not deliver before" option), sometimes (not always), the messages isn't sent on the schedule time and stays in the outbox.  
I thought that closing Outlook would help send the message, but it doesn't work.
8mathieu8Asked:
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8mathieu8Author Commented:
Your forth link answers my question.
I'll need to install SP4, my Exchange has SP3 intalled
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