Outlook Form - Save to Sent Items

[jpaf]

I have created a form and published it to the Organisational Forms Library. When users fill in the form and try to send it, it looks like it stays in their outbox (even though the addressee received it). It does not go into their SENT ITEMS folder.

I think it's an issue with the "SAVE SENT MESSAGES TO:" option. When I look at this on my PC is says SENT ITEMS and I can use the form without a problem.

However, when another user looks at this option it says "UNKNOWN", as it cannot find the sent items of the person that created the form (me).

My question is, how do you set the form to use the senders SENT ITEMS?

Thanks
jpaf