In outlook one of the ways of splitting the two emails is to create different account for each email address. Click on Settings, navigate to Show all Outlook settings, select Sync email, and work with connected accounts. Also ensure that each e-mail address is set up in a proper way so that the various in boxes do not mix.
For users working with large amounts of data it can be effectively to split PST file. Since its release, the Shoviv PST Splitter has been a great tool for the splitting of large PST files into smaller, workable files without the loss of any data. This can prove useful in increasing Outlook responsiveness and resume of the numerous email accounts it can manage.