http://www.personalgroupware.com/groupmanager/pg-offline-4-0-865.zip
Added in this release:
The option to output messages in plain HTML.
HOW TO VIDEO https://youtu.be/9TQIKv7goXo
Right click the group name In the group list. Choose "Export Messages".
In that pane you can choose the start and end points, if desired.
Now choose the "Export as Multiple HTML files" radio button.
You can set the number of messages per file in Group Settings--> Export Settings.
Now choose a folder to output the files to.
Now choose "Export". The files are written to your chosen folder.
Cheers,
Wilson.