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A message encrypted by Office 365 Message Encryption is delivered to a recipient’s inbox like any other email. It contains an HTML file attachment that the recipient can open to view the message on the Office 365 Message Encryption portal. The recipient can choose to sign in with a Microsoft account or a work account associated with Office 365, or use a one-time passcode to view the message.
If you receive an encrypted message, follow the instructions in the email message to decrypt and read it.
Note: Each passcode expires after 15 minutes. If that happens, or if you can’t open the message for any reason, re-download the attachment and follow the steps above.