I'm assuming you have been unable to use the OE 'Import'/Messages'?? That offers Outlook as an option.
If so, in the short-term to try and answer the question I think you need to 'double hop' via another email programme but I don't have time to investigate. If you have a Gmail account (its free!) this should help
Export and Backup Emails from Outlook to Gmail Online
I believe you can also go via Thunderbird and then in OE
Thunderbird - Importing Outlook Emails and Addressbooks
If it is a 'Cannot connect' problem it is probably a setting adrift in the Account settings.
but I'm sure one of the experts will have a simple solution.