Also, Diane, I'm wondering about this section of the article, as of course, the files would need to be migrated to Outlook 2016 if I wanted to access them. I technically way out of date in my knowledge, so there's every possibility you will not have to take this part of the thread into account.
"MIGRATING TO MICROSOFT EXCHANGE SERVER
If you plan to migrate your workgroup from Microsoft Mail 3.x to Microsoft Exchange Server, migrate to Microsoft Exchange Server before upgrading to Outlook 2002. Outlook 2002 does not work with Microsoft Mail 3.x post office.
The process of migrating users from Microsoft Mail 3.x post offices to Microsoft Exchange Server involves more than upgrading e-mail client software, and it is beyond the scope of the Microsoft Office XP Resource Kit. The Microsoft Exchange Server Web site contains information that takes you through all the planning and implementation steps necessary to migrate users from Microsoft Mail 3.x to Microsoft Exchange Server. A good starting place is Migrating from Microsoft Mail for PC Networks
Review this document thoroughly if you plan to move your workgroup to Microsoft Exchange Server."