To read an encrypted message by using an One Time Passcode

  1. Follow the instructions in the email message to save the attachment.
  2. Open the message.html file in the email.

    An Office 365 Encryption message

  3. Select Use a one-time passcode.

    Don't want to sign in? Get a one-time passcode.

    You can also request a one-time passcode in the portal when you are asked to create a Microsoft account to read encrypted messages.
  4. The passcode is sent to you in an email message. Get the passcode, enter it, and then click CONTINUE.

    We sent a passcode.

  5. You can now view your message.
    Each passcode expires after 15 minutes. If that happens, or if you can’t open the message for any reason, start over by opening the attachment again and following the steps. Make sure the reference code in the email containing the passcode matches the reference code in the portal.


To view an encrypted message using a Microsoft account

  1. Follow the instructions in the email message to save the attachment.
  2. Open the message.html file and select Sign in.

    Sign in to view your encrypted message

    If a message appears that asks if you want to submit information to an external page, choose OK. You may also need to allow pop-ups, if your web browser blocks them.
  3. Sign in to the encryption portal with a Microsoft account, as instructed in the message. If you don’t have a Microsoft account, you can choose the option to create one associated with your email address. (You’ll have to fill out a form and complete a verification step.) In order to view the encrypted message, he email address for the Microsoft account must match the address to which the encrypted message was sent.

    If you’re already signed in, you won’t have to sign in again.

  4. After signing in, you can view the contents of the encrypted message.
    If you are inactive for more than 15 minutes, you are automatically signed out of the encryption portal.

To reply to an encrypted message

  1. Choose Reply or Reply All.
  2. On the page that appears, type a reply and choose Send. An encrypted copy of your reply message is sent to you.