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For Windows users who want a lightweight footprint:
Microsoft does not offer an official "portable" version of Office 365 (now Microsoft 365 ) that can be run from a USB drive without installation. Official deployment methods require a full local installation or access via a web browser. Official Deployment vs. "Portable" Concepts microsoft office 365 download center portable
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The search for a "Microsoft Office 365 download center portable" leads to dangerous, unofficial software modifications. Microsoft does not offer a downloadable portable executable for Office 365.
Can You Download a Portable Microsoft Office 365? The short answer is Official Deployment vs
If you find a website offering a "Microsoft Office 365 portable" version, it is not an official Microsoft product. These files are unauthorized, modified versions created by third-party crackers. How Unauthorized Portable Versions Are Made
Microsoft 365 uses a Software-as-a-Service (SaaS) model. The applications must regularly communicate with Microsoft activation servers to verify user credentials and subscription status. Built-in Digital Rights Management (DRM) makes it exceptionally difficult to contain the software within a standalone, isolated directory on a thumb drive.