A quick Google search brought up these instructions as an option.
Outlook Options
1) Drag Emails from Outlook to a Folder.
2) Export Everything to an Outlook PST File.
3) Use the "Save as" Command in Outlook.
4) Use a Script or Third-Party Tool to Save Outlook Emails in Other Formats.
5) Use a Desktop Email Client.
6) Use a Gmail Backup Service or Program.
For step 4, I suggest you try
Zamzar
OpenOffice 4.1.7, LibreOffice 7.0.1.2 on Windows 7 Pro, Ultimate & Windows 10 Home (2004)
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