Microsoft offers free web-based versions of Word, Excel, and PowerPoint. They run in any modern web browser, require no installation, and provide perfect compatibility with modern file formats without costing a dime. LibreOffice Portable
While this setup sounds ideal for older, trusted software like Office 2007, the method used to achieve portability introduces severe risks when dealing with proprietary software. The Hidden Dangers of Downloading Office 2007 Portable Microsoft Office 2007 Portable Download