Mori can import a number of different text document formats, and it can also import your old Hog Bay Notebook 3.5 documents. To import content into Mori.
A shortcut to importing files is to drag them from the Finder and drop them into Mori’s “source” or “entries” view to start the import process. If you drop them into the “note text view” the files will be attached to the entry displayed in that view instead of imported as distinct entries into your Mori notebook.
The only Hog Bay Notebooks which Mori can import are formats from version 3.5. Or you can just export your entries as a hierarchy of text files and folders and then import that file folder hierarchy into Mori.