Standard software (like traditional Office 2003) writes hundreds of entries into the Windows Registry, installs shared DLLs in System32, and buries activation tokens deep within the OS. This means you cannot simply copy the "Program Files" folder to a USB drive and run it on another computer.
However, "repackers" online have created three types of "Portable" versions: installs shared DLLs in System32
This is the most common result of searching for an "exclusive version." Cybercriminals package a screensaver or a keylogger as "Office2003_Portable_Exclusive.exe." When run, it infects the host with ransomware or botnet malware. installs shared DLLs in System32