'Attachment encoded in a format OWA doesn't recognize'

windows

Symptoms

OWA refuses to render an attachment.

Likely cause

Attachment uses a content type / encoding OWA cannot display.

Fix

1. Reply to the sender and ask them to resend in a standard format (PDF, DOCX, JPG). 2. Or have them resend unencrypted (S/MIME-encrypted attachments sometimes confuse OWA's renderer).

Sourced from militarycac.com. Rewritten for clarity.

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