Exporting public folder SMTP addresses, and import into Office 365

Hello

We are migrating to Office 365 from Exchange 2003.  In the legacy environment we have several public folders which have hundreds of SMTP addresses applied to them.  I would like to add these addresses to a shared mailbox in Office 365.  Does anyone have any suggestions as to firstly, whether I can export the addresses out of the Exchange 2003 environment, and secondly whether I can use Powershell to import those addresses into Office 365?

Any assistance would be gratefully received.

Thanks

Paul