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Microsoft does not offer a standalone "portable" executable (often referred to as a "PAF" or "U3" format) for the full Office 365 desktop suite. Official portability is instead achieved through the following methods: System requirements for Microsoft 365 for home use
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Because these are community-made, they often bypass standard activation. This makes them unofficial and potentially risky, as unofficial downloads can carry malware. Official Alternatives Microsoft does not offer a standalone "portable" executable