View encrypted messages on your iPhone or iPad

Many organizations, companies, and individuals use Office 365 Message Encryption to send encrypted messages to help protect confidential email content. If you’re on your iPhone or iPad and you’ve received a message encrypted with Office 365 Message Encryption, you can use the free OME Viewer app to view the message and send an encrypted reply.

Office 365 Message Encryption Viewer

To get started, you must first download the OME Viewer app from the App Store.
You must be on your iOS mobile device to download the mobile app from this link.

Download OME Viewer from the App Store

You can also view encrypted messages on your Android device or your desktop computer.

Use the OME Viewer app to view an encrypted message

Whether you’re using Outlook for iOS, the built-in iOS Mail app, or a Gmail app, the OME Viewer works alongside these popular mail apps so you can easily view and reply to the encrypted messages that you receive.

Choose your email app in the options below:

Use OME Viewer with the Outlook for iOS mobile app
  1. Open the encrypted message in Outlook for iOS. When you open the message, you’ll see an attachment called message.html. Tap the message.html attachment.

    OME Viewer for Outlook for iOS 1

  2. In the message attachment, tap the arrow in the upper right-hand corner. Tap Open in… and then tap Copy to OME Viewer.

    OME Viewer for Outlook for iOS 2 OME Viewer for Outlook for iOS 3

    Note: In order to complete this step, you must have OME Viewer installed on your iPhone or iPad.

  3. In the OME Viewer, tap Use a one-time passcode.

    Note: You may see an option that says Sign In if you are viewing an older message that was sent in August or earlier. Simply continue with the steps outlined here by selecting Use a one-time passcode.

    One time passcode

  4. You’ll receive an email containing the passcode you need in Outlook for iOS. The email will be sent to the email address to which the original encrypted message was sent. Open the email and tap the passcode. If prompted to open in OME Viewer, tap Open.

    OME Viewer - Passcode Received

    Tip: If you don’t see an email from Microsoft Office 365 Message Encryption, check the Other tab in Outlook for iOS or your junk email box.

You will now be able to view your encrypted message, download any attachments, or reply with your own encrypted message.

Use OME Viewer with the built-in iOS Mail app
  1. Open the encrypted message in the iOS Mail app. When you open the message, you’ll see an attachment called message.html. Tap the message.html attachment to open it.

    OME Viewer for iOS Mail app 1

  2. In the message attachment, tap the top of your screen to display the actions bar. Now tap the arrow in the upper right-hand corner. Scroll right and select Copy to OME Viewer.

    Note: In order to complete this step, you must have OME Viewer installed on your iPhone or iPad.

    OME Viewer with Gmail 2 OME Viewer with Gmail 3

  3. In the OME Viewer, tap Use a one-time passcode.

    Note: You may see an option that says Sign In if you are viewing an older message that was sent in August or earlier. Simply continue with the steps outlined here by selecting Use a one-time passcode.

    One time passcode

  4. You’ll receive an email containing the passcode you need in your Mail app. The email will be sent to the email address to which the original encrypted message was sent. Open the email and tap the passcode. If prompted to open in OME Viewer, tap Open.

    OME Viewer - Passcode Received

    Tip: If you don’t see an email from Microsoft Office 365 Message Encryption, check your spam folder.

You will now be able to view your encrypted message, download any attachments, or reply with your own encrypted message.

Use OME Viewer with the Gmail app on iOS
  1. Open the encrypted message in the Gmail app. When you open the message, you’ll see an attachment called message.html. Tap the message.html attachment to open it.

    OME Viewer with Gmail 1

  2. In the message attachment, tap the top of your screen to display the actions bar. Now tap the arrow in the upper right-hand corner. Scroll right and select Copy to OME Viewer.

    OME Viewer with Gmail 2 OME Viewer with Gmail 3

    Note: In order to complete this step, you must have OME Viewer installed on your iPhone or iPad.

  3. In the OME Viewer, tap Use a one-time passcode.

    Note: You may see an option that says Sign In if you are viewing an older message that was sent in August or earlier. Simply continue with the steps outlined here by selecting Use a one-time passcode.

    One time passcode

  4. You’ll receive an email containing the passcode you need in your Gmail app. The email will be sent to the email address to which the original encrypted message was sent. Open the email and tap the passcode. If prompted to open in OME Viewer, tap Open.

    OME Viewer with Gmail 4

    Tip: If you don’t see an email from Microsoft Office 365 Message Encryption, check your spam folder or filter options.

You will now be able to view your encrypted message, download any attachments, or reply with your own encrypted message.

Use OME Viewer with the Yahoo Mail app on iOS
  1. Open the encrypted message in the Yahoo Mail app. When you open the message, you’ll see an attachment called message.html. Tap the message.html attachment to open it.

    OME Viewer with Yahoo 1

  2. In the message attachment, tap the arrow in the upper right-hand corner. Tap Open in... and then tap Copy to OME Viewer.

    OME Viewer with Yahoo 2 OME Viewer with Yahoo 3

    Note: In order to complete this step, you must have OME Viewer installed on your iPhone or iPad.

  3. In the OME Viewer, tap Use a one-time passcode.

    Note: You may see an option that says Sign In if you are viewing an older message that was sent in August or earlier. Simply continue with the steps outlined here by selecting Use a one-time passcode.

    One time passcode

  4. You’ll receive an email containing the passcode you need in your Yahoo Mail app. The email will be sent to the email address to which the original encrypted message was sent. Open the email and tap the passcode. If prompted to open in OME Viewer, tap Open.

    OME Viewer with Yahoo 4

    Tip: If you don’t see an email from Microsoft Office 365 Message Encryption, check your spam folder or filter options.

You will now be able to view your encrypted message, download any attachments, or reply with your own encrypted message.

Use OME Viewer with an email app on iOS
  1. Open the encrypted message from the email app on your iPhone or iPad. When you open the message, you’ll see an attachment called message.html. Tap the message.html attachment to open it.

  2. Choose Copy to OME Viewer.

    Note: In order to complete this step, you must have OME Viewer installed on your iPhone or iPad.

  3. In the OME Viewer, tap Use a one-time passcode.

    Note: You may see an option that says Sign In if you are viewing an older message that was sent in August or earlier. Simply continue with the steps outlined here by selecting Use a one-time passcode.

  4. You’ll receive an email containing the passcode. The email will be sent to the email address to which the original encrypted message was sent. Open the email and tap the passcode. If prompted to open in OME Viewer, tap Open.

    Tip: If you don’t see an email from Microsoft Office 365 Message Encryption, check your spam folder or filter options.

You will now be able to view your encrypted message, download any attachments, or reply with your own encrypted message.

Do more with your OME Viewer

  1. With an encrypted message open in OME Viewer, tap the reply arrow icon.

    OME Viewer - Reply 1

  2. Tap Reply or Reply All. You can also choose to forward the message.

  3. Type your reply and tap Send.

    OME Viewer - Reply 2

Your reply message is encrypted, and an encrypted copy of your reply is sent to you.

  1. With an encrypted message open in OME Viewer, tap on the attachment.

  2. Tap Preview Attachment to see the attachment within the OME Viewer. You can also choose to Open Attachment in a different app.

Troubleshooting tips for OME Viewer

Need help accessing your encrypted message? Try these tips below:

  • If you are stuck on a loading screen or nothing has loaded, exit the app and go through the steps again.

  • If you don't see your passcode email from Microsoft Office 365 Message Encryption in your inbox, check your spam folder or filter options.

  • If your passcode is no longer valid because 15 minutes or more have passed, go through the steps above again to request a new passcode.

  • If you've clicked on the passcode and nothing has loaded, return to the passcode email and tap it again.

  • Why does my encrypted message email look different than the screenshots on this page? Organizations who use Office 365 Message Encryption are able to customize their messages to their recipients. While the email may look different according to the organization's branding, the general steps will be the same.

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