Delayed Messages are not sent if Outlook is closed

Dear all.

We're having a Network with different sites.
All are having Win 2008 SP2 Servers and Exchange 2010, all Updates.
The Clients are working with Windows 7 and Outlook 2010.

On our site, a user tried to send a delayed mail. He set up the mail, set the delay date and time and sent the mail. After trying to close Outlook, he got a warning, that the mail will not be sent while outlook is closed, and what a surprise, it hasn't worked. They stay in the outbox and have to be sent manually.

But on the other sites we have, where we have the same Software-Configuration, the users are able to send mails that way. Exchange is delivering the email without a problem, even if outlook is closed.

Does anyone know, where i can set this functionality in Exchange/Outlook?
Thank you for your help.
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Can you check and see how the users Account is setup in Outlook

Is it setup as an POP or IMAP Account?
If it is, Outlook MUST be open to send the delayed email

I would also physically compare the users OUtlook Account Settings to those of another user you have actually seen this work on
Jamie McKillopIT ManagerCommented:

Is Outlook in cached mode? The delay send only works if Outlook is not in cached mode.


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Gorbi999Author Commented:
This was the solution. Turned off cached mode and it worked fine.
Thanks for the hint.

@apache09: Thank you for your answer, but we're using Exchange (not with POP/IMAP). With POP/IMAP it would be clear.
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