outlook 2010 emails not shown in SENT box

I run an accounting program called PASTEL ACCOUNTING which generates emails that are sent to OUTLOOK 2010's outbox. i can see them in the outbox and they are subsequently sent correctly. i know this because they are received correctly by the recipient. However once the mail has left the Outbox it is not stored in the SENT folder and i therefore have no record of its existence!
PASTEL tell me that since it has found its way into OUTLOOK it must be an OUTLOOK problem! i have a feeling MS will tell me its a PASTEL problem...how do i solve this?
PS this did not happen under OUTLOOK 2003 when everything worked properly.

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gusqqq

I get that occasionally.

Is the account wherein you don't see the "Sent Mail" items an IMAP account?

i have a number of email accounts within outlook. they are all pop3 accounts including the default account which is presumably the one used by outlook to automatically send the email that originates from the 3rd party accounting program...