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I think your needs maybe satisfied... OmniOutliner will be coming to the iPad. It's the nearest I've found to OneNote on the Mac. (And Evernote should not be compared to OneNote, very different products!)......

No way. The best and most unique feature of Onenote is the free-flowing/container based of note taking. No other application is like it except for Zoho's Notebook. It's more of a hybrid mindmapping/journaling/note-taking application all together.

Outliner is an outlining tool/structured note taking, completely different from both Evernote and OneNote.
 
It's here

MS has created OneNote for both iPad and iPhone -both FREE for now! I've used MobileNoter for a long time and OneNote even longer which I love. OneNote is also in the cloud so I can create new notebooks etc. on the run.

You have to be using OneNote 2010 for it to work though and I'm still working out moving my existing files to my SkyDrive and synching to the desktop. Works good if its a new notebook that you create in the cloud and then download to your OneNote client. That sync's and works great.

Microsoft might "get" this iPad thing yet! ;)

http://itunes.apple.com/us/app/onenote/id410395246?mt=8?WT.mc_id=oo_enus_eml_ON4IP
 
For Mac users and OneNote wannabes: Growly Notes (http://growlybird.com/GrowlyBird/Notes.html)

It's a onenote clone, and it's free as well. It's the closest thing I've found to Onenote, it's almost the same. Only thing lacking is the SkyDrive sync as well as having a big developer like microsoft back it up. Last thing I'd want is my Growly Notes app stop working one day and have no other way to access my notes saved to a proprietary format. However functionality wise, I think it's a perfect replacement. And it's free!!

I've given up my search for a replacement and use OneNote through VM Fusion on my mac, apparently there's an iPhone app out too (US store only).
 
iPad onenote app

Looks like there is one more OneNote clone is coming to iPad. See their launch page here http://onenoteipad.com. Good thing is that it seems to be optimized for iPad, which is not the case with app from MS.
 
incompatible

I think most of your comments are right BUT to say that MS don't make the update/newer version of programs compatible with their old one. One reason why Windows is relatively in-secure is they can't/won't the new version incompatible. The reason is they like to hold on to customers who invested a lot of $$ in their systems. Frequently, they don't disgard the original format even if they found there is problems/bugs in there. They won't do what Apple did when they switch from OS 9 to OS X. You can question their motivation (money) but they don't make new programs that is incompatible with old one unless absolutely HAVE to.



For Mac users and OneNote wannabes: Growly Notes (http://growlybird.com/GrowlyBird/Notes.html)

It's a onenote clone, and it's free as well. It's the closest thing I've found to Onenote, it's almost the same. Only thing lacking is the SkyDrive sync as well as having a big developer like microsoft back it up. Last thing I'd want is my Growly Notes app stop working one day and have no other way to access my notes saved to a proprietary format. However functionality wise, I think it's a perfect replacement. And it's free!!

I've given up my search for a replacement and use OneNote through VM Fusion on my mac, apparently there's an iPhone app out too (US store only).
 
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