Hi @luke_9214,
Thanks for reaching out! The message you’re seeing — “This PDF file is protected… The reader you are using does not support opening files protected by Microsoft Office” — indicates that the PDFs are protected using Microsoft Information Protection (MIP) / RMS encryption, not Acrobat’s own password/security features.
That usually happens when:
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The PDFs were created/exported from Word, Excel, Outlook, or another Office app that had sensitivity labels or IRM protection applied (sometimes by company policy, even if you didn’t set it manually).
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The files were then attached to an email or shared, and Acrobat (or most standard PDF readers) cannot open them because they require Microsoft’s own viewer.
A couple of clarifications that would help narrow this down:
- How were the PDFs created — directly exported from an Office app, or printed to PDF?
- Are you opening them in Adobe Acrobat/Reader, or in another viewer?
- Are you on a work account (with Microsoft 365) that may have policies automatically applying protection?
Next steps you can try:
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If you’re on Windows, try opening the PDFs with Microsoft Edge or Office itself (those support MIP-protected PDFs).
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If you want these files to be readable in Acrobat/Reader, you’ll need to export them without MIP protection — typically by saving/exporting again from Office without sensitivity labels or with protection turned off (if your IT policies allow it).
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If this is on a corporate device, your IT team may have set rules that automatically add protection. In that case, best to check with them.
Let us know how it works.
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