Using an unofficial, 100 MB portable version of Office 2007 carries significant dangers: Microsoft Office 2007 Portable | PortableApps.com

One rainy Tuesday, the library’s main server crashed. The head librarian was panicking; the annual budget report was due in an hour, and her desktop was a brick.

: Ideally, it does not modify the Windows registry or leave behind temporary files on the host computer. Included Features (Word & Excel 2007)

: Office 2007 reached its end of life on October 10, 2017 , meaning it no longer receives security updates or technical support. Using an unofficial portable version significantly increases the risk of malware or backdoors being present in the software.