: Highly resource-efficient. It was designed to run on systems with as little as 256MB of RAM and 433MHz processors. A portable version typically runs as a single executable without deep system integration, making it "lightweight".
Having a portable version of Microsoft Office 2003 offers several advantages: Microsoft Office 2003 - Portable Version full version
: Official support for Office 2003 ended on April 8, 2014 . Because it no longer receives security patches, using any version—especially a "portable" one from an unverified source—can expose your system to modern malware and security risks . : Highly resource-efficient
You do not need administrative rights to run it. Microsoft Office 2003 - Portable Version full version