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I don't believe the OneNote Metro app supports indexing handwritten notes.

If you open the same notebook in the Win32 client and allow it to index and sync back to Sky/One/WhateverIt'sCalledThisWeekDrive you should be able to search through previously handwritten and Win32-client-OCRd notes in the Metro app.

Interesting. I'll try that.

You need the full version of OneNote for the recognition.

It's vastly superior, but on the plus side, if you're using OneDrive or Office 365, you can edit existing notes either one depending on your needs for a given situation.

There's a free version of OneNote and a paid version, presumably this feature is in the paid version

The Metro version of OneNote doesn't, but Windows Journal does and it's installed on the Surface by default. It's a legacy app though.