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Short answer: you don't

Long answer: Notes RichText is sufficiently different from RTF that a 100% preservation will most likely not work. The main point of contention will be the embedded objects. OLE is all but dead.

What you can do:

PLAN1:

a) get Ben's RichText -> MIME enhancer

b) Use a script to extract content into MIME (works with everything short of OLE, works much better with Ben's magic, but basic works to some extend too

c) use that same script to write it into OneNote

PLAN2:

d) extend the script to activate all OLE objects, save them as files to the file system, delete the embedded object, reattach -> go back to a)

PLAN3:

Use a powershell script and automate the copy/paste operation -> wild guess what would happen to OLE objects and sprinkled in attachments

Thank you, Stephan. Good suggestions to evaluate. I appreciate the pointer to Ben as well. I'll reach out to see what his tool can do as well.

I'm afraid that OneNote is very limited in how it takes in data. I assumed it had to be able to import something, if nothing else HTML, but it doesn't. We can generate a number of formats, but OneNote doesn't accept any of them, even their own. They use an old Word .doc format internally, but don't even offer an import for .doc files. Given all that, you may be very limited in what you can do. It sounds like your best bet may be using the OneNote print driver and creating images of your pages, but they won't be editable. I could generate them all as MHT files and you could insert them as attachments, but they still wouldn't be editable, and each would have to be launched to view.

As a caution, it doesn't look all that much easier to get anything OUT of OneNote either, so you may be moving to a fairly closed system.

Sorry I couldn't help more, Good luck!

If it helps there is an api for OneNote Online, you can use PowerShell to post html to it.