I have a client with Outlook 2013 with Office 365. When she sends an email with addresses in BCC field there is no way to see those addresses in the sent folder. If you open the email in the sent items, it just shows her name. There are no BCC names and there is no way to show them.
If you click to resend the message, it still does not show the addresses that the email was originally sent to.
There has to be some way to see who you sent the email to.