We're having an issue with Outlook, we use a piece of software called Abaca, which is used to print off/email purchase orders, sales order etc. so, when we send a purchase order off through email, the email goes from the outbox to the sent items folder (as it should) but then after a very short period of time, the email then disappears and doesn't appear in deleted items. This seems to be an isolated incident on one desktop as we have tried it on two other machines and everything works fine, it's also worth noting that when we send a normal email from the affected machine, the email stays in the sent items folder.
Any suggestions?