While the promise of a tiny, no-installation version of Office 365 sounds appealing for low-end PCs or USB sticks, the security risks, instability, and legal implications make this a dangerous choice for any serious user.
| Metric | Installed Office 365 | Portable (USB 3.1) | Portable (USB 2.0) | | :--- | :--- | :--- | :--- | | | 1.2 sec | 2.8 sec | 8.5 sec | | Save 50MB PPT | 0.5 sec | 1.1 sec | 12 sec | | Spellcheck Lag | None | Minimal | Noticeable | | Update Download | 200MB (delta) | 200MB (delta) | 200MB (delta) | | Registry Footprint | 1,200+ keys | 0 (after cleanup) | 0 | portable microsoft office 365 highly compressed upd