I just installed OneNote on my Samsung Infuse 4G after an OS update via Kies. No, I didn't get an update notice on my phone. I manually checked every week or so for a couple of months. At least Android OS 2.3 Honeycomb is what is needed to run OneNote. The issue is not hardware. It's OneNote's dependency on the operating system's version. Mine was 2.2.3...