: Portable versions do not connect to Microsoft Update. Users remain vulnerable to critical security flaws discovered after the software's release.
Microsoft offers free, lightweight web versions of Word, Excel, and PowerPoint. They run in any browser on any computer – no installation, no USB needed. Microsoft Office 2013 Portable Download
Microsoft once offered (in Enterprise editions) – a full Windows installation on a USB. You can install real Office 2013 on that USB. When you boot from the drive, you have a complete, legal, portable Office. : Portable versions do not connect to Microsoft Update