Do you have a netbook from 2009 running Windows XP or Windows 7? Modern Office versions (2016, 2019, 2021) will crawl or fail to install. The 2007 Portable Edition runs like lightning on old Pentium processors and 1GB of RAM.
If you need an offline suite that you can legally make portable: LibreOffice Portable microsoft+office+2007+portable+edition+updated
If you use Office 2007 to open newer files, ensure the Office Compatibility Pack is integrated to handle modern .docx and .xlsx files [5, 25]. Do you have a netbook from 2009 running