Unofficial portable versions are created by third-party repackers who modify the original Office installation. They typically:
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Microsoft regularly releases security patches to fix vulnerabilities in Office 2019. Portable versions are completely severed from the Microsoft Update network. They are frozen in the state they were packaged in. If a new exploit is discovered in Word or Excel, your portable version will remain permanently vulnerable, risking system infection every time you open a document. 3. Instability and Broken Features If you share with third parties, their policies apply