Outlook 2010 - Retrive email information

Does anyone have any experience of retrieving emails sent using outlook 2010 when there is no record of the sent message (it's not in the sent messages folder)? By retrieve I do not mean recalling the message - just obtaining evidence of when it was sent and who too.

Situation is as follows -
* message was sent from a team email address to give some anonymity - not for anything illegal - just to ensure that the sender was anonymous.
* message was blind copied to over 10 people.
* blind copy obviously does not indicate any of the other recipients.
* recipient is denying having received it.
* I'd like to check if they are lying to me as it has massive implications.

Whilst this is not necessarily a forensic question, there are elements that could be applied in digital forensic work. And to be honest I'm really not sure which other section to post the question in.

I have no admin privileges on this system. I can boot to Mini-WinFE/WinPE - can't access the emails on the domain if I do, so I'm consequently restricted to using a basic account to obtain this information.

Any help is appreciated.

Regards,

Misty