I would like to recommend another Restore Exchange Server tool for retain your old emails again and you can migrate your mailbox to another live Exchange server. This application helps you to retain the same and another format such as PST, MSG and EML. you can download from http://www.restoreexchangeserver.net and much more information about its features.
I would suggest you to please follow the Jhon answer. It is best and it can solve your problem.