You install a full copy of Windows 10/11 onto a high-speed USB 3.2 SSD (128GB minimum). You boot the host computer from that USB drive. Once booted, you install Microsoft OneNote normally onto that portable Windows environment.
If the computer has OneNote (any version), double-clicking a .one file from your USB drive will open it in read/write mode. You can copy the file back to your USB drive as a backup. Microsoft Onenote Portable
While Microsoft does not provide an official "portable" version of OneNote (like a standalone .exe designed to run from a USB drive without installation), you can achieve portability through cloud synchronization, mobile apps, or manual local backups on removable storage. You install a full copy of Windows 10/11
This is not a portable app; it is a portable operating system. If the computer has OneNote (any version), double-clicking a