2 points
I came back here to say “It says right on their home page that it’s open source.” :-) I installed it & I’m running the importer now to see how well it handles large numbers of notes. Thanks much for the tip!
3 points
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I did find that with a very large OneNote account the importer struggled, specifically because OneNote was timing out and rejecting the requests after a while.
My solution was to backup (in onenote) and then delete the notebooks that had been moved already and then run the importer again.
