Microsoft’s business model relies on user accounts, telemetry, and cloud subscriptions. A truly portable app that leaves no trace would bypass Windows licensing checks, OneDrive upsells, and usage analytics. It is commercially counterintuitive for them.
Advanced users sometimes attempt to "thinapp" or virtualize the OneNote installation (creating a virtual bubble). However, because OneNote requires synchronization with Microsoft servers and specific registry keys to function correctly, this method is notoriously unstable. It frequently breaks sync features and can corrupt your notebooks. Microsoft Onenote Portable
allow you to carry your entire notebook library in your pocket. Cloud Syncing : By storing notebooks on Advanced users sometimes attempt to "thinapp" or virtualize
While not OneNote, these "second brain" apps can be run entirely from a local folder or USB drive with minimal setup. Standard Notes: allow you to carry your entire notebook library