You don't need to install anything. Go to office.com, sign in with a free Microsoft account (Outlook/Hotmail), and use Word, Excel, and PowerPoint in your browser. It saves to OneDrive. This is 100% portable, 100% legal, and 100% safe.
Before diving into Office specifically, we must understand the portable concept. Microsoft Office 2007 Portable Download
Traditional software (like standard Office 2007) writes hundreds of entries into the Windows Registry, copies DLL files to System32 folders, and ties itself to a specific machine. If you try to move it to a USB drive, it will crash instantly. You don't need to install anything
Portable software is modified to run entirely from a single folder. It stores its settings in an .ini file within that folder rather than the Registry. Theoretically, you can plug a USB stick into any Windows PC (XP, Vista, 7, 8, 10, or 11), double-click Word.exe, and start typing without installing anything. This is 100% portable, 100% legal, and 100% safe
No. Absolutely not.
While the idea of slipping a USB stick into a library computer and firing up Microsoft Word 2007 is nostalgic and appealing, the reality is grim:
Despite the availability of Office 365 (subscription) and Office 2021 (perpetual license), the search for Office 2007 Portable remains high for several reasons: