Because it’s portable, it doesn’t write to the Windows Registry or leave "junk" files on your system. Low Resource Usage:
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"Office On-The-Go"
If you absolutely must use Office 2003, dig up your original CD, install it on a dedicated offline Windows XP virtual machine, and never connect it to the internet. Because it’s portable, it doesn’t write to the
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Sources used for information: [1] General knowledge on Microsoft Office 2003 functionality.