One reason Office 2003 might not work better on modern Windows is missing fonts. Copy the Fonts folder from your old Windows XP installation into the portable app's sandbox directory.
The answer is nuanced: How It Works Better:
(support ended in 2014). It contains known security vulnerabilities that are not patched. Additionally, official "Portable" versions were never released by Microsoft—most downloads claiming to be "Office 2003 Portable" are either: microsoft office 2003 portable download work better
Office 2003 is incredibly lightweight by modern standards. On an old laptop or a computer with minimal RAM (like a Netbook or older Windows XP/7 machine), a portable Office 2003 opens instantly and runs efficiently [1]. 2. No Installation Hurdles
Unofficial "portable" packages found on torrent sites or shady blogs frequently come bundled with trojans, keyloggers, and spyware. One reason Office 2003 might not work better
Cloud suites are useless without the internet. Office 2003 Portable is fully offline. You can work on a plane, in a basement, or on a secured military network with no external access. It never lags because of a poor Wi-Fi signal.
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Performance