If you are looking for the speed and portability of Office 2003 without the security risks, consider these modern alternatives:
Microsoft never officially released a "portable" version of Office 2003 Microsoft Office 2003 - Portable Version full version
Web-based, requires no installation, and handles most legacy .doc and .xls files. ✅ Recommendation If you are looking for the speed and
Even though the software is old, it is not "abandonware." You still technically require a valid product key to use it legally. Modern Alternatives requires no installation