Microsoft Office Portable Mega [2025]

Hosted officially by PortableApps.com. 100% free, 100% legal. Reads and writes Microsoft files (with 95% fidelity). The only downside is the UI looks like Office 2003 unless you change the theme.

If you absolutely need genuine MS Office portability, consider a drive or a licensed copy installed on a removable SSD with Windows pre-installed. Microsoft Office Portable Mega