You can extract data from a public folder using Outlook.
Here are the steps:
- In Outlook, click on File > Open & Export > Import/Export.
- Select Export to file and click Next. Then Select Outlook Data File (.pst) and click Next.
- The full structure of mailbox, along with all the account accessible folders will be shown. Now, expand the Public Folders and find the folder you wish to export and click on it. Make sure to tick the Include subfolders checkbox and click Next. If you would like to make some filtering options, click on the Filter button.
- The export process will take time, depending on the size & complexity of your public folder and the resources you are using.
For the detailed process check this reference: https://www.stellarinfo.com/article/export-public-folder-to-pst.php
Let me know if this works for you!!