Note: Microsoft does not officially offer a portable version. The portable version is created by third‑party packagers using legally obtained OneNote files. Always respect Microsoft’s licensing terms.
The most reliable way to access OneNote on any computer without installing software is via the web. Microsoft Onenote Portable
The most famous ecosystem for portable Windows software is . They maintain a launcher and a "portable" version of OneNote. However, there is a critical nuance: PortableApps.com does not host a native OneNote port . Instead, they host a launcher for OneNote 2010 if you already own a legitimate license and installation media. Note: Microsoft does not officially offer a portable version