View encrypted messages on your Android device

Organizations, companies, and individuals around the world use Office 365 Message Encryption to send confidential email content to protect privacy and security. If 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 Google Play Store.
You must be on your Android mobile device to download the app from this link.

Download OME Viewer from the Play Store

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

Use the OME Viewer app to view an encrypted message

Whether you’re using Outlook for Android, the Android Email app, or a Gmail app, the OME Viewer works alongside 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 Android mobile app
  1. Open the encrypted message in Outlook for Android. When you open the message, you’ll see an attachment called message.html. Tap the message.html attachment and then tap OME Viewer.

    Note: In order to complete this step, you must have OME Viewer installed on your Android phone or tablet.

    OME Viewer with Outlook for Android 1

    OME Viewer with Outlook for Android 2

  2. Choose one of the methods for verifying your account below.

    Use a one-time passcode

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

    OME Viewer - Passcode Message

    Sign In with your Microsoft Account

    You can also verify your identity by using your Microsoft Account, such as a hotmail.com, outlook.com, or Office 365 work or school email address. Tap Sign In.

    Note: If you do not have a Microsoft account, you will need to create one. You can create a Microsoft account with your existing email address.

    Select Sign In to use your MSA

  3. Continue the steps for the option you chose above.

    Use a one-time passcode

    If you selected "Use a one-time passcode," you’ll receive an email containing the passcode you need in Outlook for Android. The email will be sent to the email address to which the original encrypted message was sent. Open the email and tap the passcode.

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

    OME Viewer Passcode Email

    Sign In with your Microsoft Account

    If you've chosen to sign in with your Microsoft account, enter your email address and password, and then tap Sign In. If you don't have a Microsoft Account and would like to create one, tap Sign Up Now and complete the form.

    Sign into the OME Viewer

  4. 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 Samsung Email app
  1. Open the encrypted message in the Android Email app. When you open the message, you’ll see an attachment called message.html. Tap the message.html attachment, then choose OME Viewer.

    Note: In order to complete this step, you must have OME Viewer installed on your Android phone or tablet.

    OME Viewer with Android Email app 1

    OME Viewer with Android Email app 2

  2. If prompted with the Microsoft Software License Terms, tap Accept to continue.

  3. Choose one of the methods for verifying your account below.

    Use a one-time passcode

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

    OME Viewer - Passcode Message

    Sign In with your Microsoft Account

    You can also verify your identity by using your Microsoft Account, such as a hotmail.com, outlook.com, or Office 365 work or school email address. Tap Sign In.

    Note: If you do not have a Microsoft account, you will need to create one. You can create a Microsoft account with your existing email address.

    Select Sign In to use your MSA

  4. Continue the steps for the option you chose above.

    Use a one-time passcode

    If you selected "Use a one-time passcode," you’ll receive an email containing the passcode you need in the Email 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.

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

    OME Viewer Passcode Email

    Sign In with your Microsoft Account

    If you've chosen to sign in with your Microsoft account, enter your email address and password, and then tap Sign In. If you don't have a Microsoft Account and would like to create one, tap Sign Up Now and complete the form.

    Sign into the OME Viewer

  5. 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
  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, then choose OME Viewer.

    Note: In order to complete this step, you must have OME Viewer installed on your Android phone or tablet.

    OME Viewer with Gmail on Android 1

    OME Viewer with Gmail on Android 2

  2. If prompted with the Microsoft Software License Terms, tap Accept to continue.

  3. Choose one of the methods for verifying your account below.

    Use a one-time passcode

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

    OME Viewer - Passcode Message

    Sign In with your Microsoft Account

    You can also verify your identity by using your Microsoft Account, such as a hotmail.com, outlook.com, or Office 365 work or school email address. Tap Sign In.

    Note: If you do not have a Microsoft account, you will need to create one. You can create a Microsoft account with your existing email address.

    Select Sign In to use your MSA

  4. Continue the steps for the option you chose above.

    Use a one-time passcode

    If you selected "Use a one-time passcode," you’ll receive an email containing the passcode you need in the 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.

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

    OME Viewer Passcode Email

    Sign In with your Microsoft Account

    If you've chosen to sign in with your Microsoft account, enter your email address and password, and then tap Sign In. If you don't have a Microsoft Account and would like to create one, tap Sign Up Now and complete the form.

    Sign into the OME Viewer

  5. 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
  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, tap View, and then choose OME Viewer.

    Note: In order to complete this step, you must have OME Viewer installed on your Android phone or tablet.

    OME Viewer with Yahoo Mail on Android 1

    OME Viewer with Yahoo Mail on Android 2

  2. Choose one of the methods for verifying your account below.

    Use a one-time passcode

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

    OME Viewer - Passcode Message

    Sign In with your Microsoft Account

    You can also verify your identity by using your Microsoft Account, such as a hotmail.com, outlook.com, or Office 365 work or school email address. Tap Sign In.

    Note: If you do not have a Microsoft account, you will need to create one. You can create a Microsoft account with your existing email address.

    Select Sign In to use your MSA

  3. Continue the steps for the option you chose above.

    Use a one-time passcode

    If you selected "Use a one-time passcode," you’ll receive an email containing the passcode you need in the 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.

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

    OME Viewer Passcode Email

    Sign In with your Microsoft Account

    If you've chosen to sign in with your Microsoft account, enter your email address and password, and then tap Sign In. If you don't have a Microsoft Account and would like to create one, tap Sign Up Now and complete the form.

    Sign into the OME Viewer

  4. 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 Android
  1. Open the encrypted message from the email app on your Android mobile device. When you open the message, you’ll see an attachment called message.html. Tap the message.html attachment and choose to open it in the OME Viewer.

    Note: In order to complete this step, you must have OME Viewer installed on your Android phone or tablet.

  2. Choose one of the methods for verifying your account below.

    Use a one-time passcode

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

    OME Viewer - Passcode Message

    Sign In with your Microsoft Account

    You can also verify your identity by using your Microsoft Account, such as a hotmail.com, outlook.com, or Office 365 work or school email address. Tap Sign In.

    Note: If you do not have a Microsoft account, you will need to create one. You can create a Microsoft account with your existing email address.

    Select Sign In to use your MSA

  3. Continue the steps for the option you chose above.

    Use a one-time passcode

    If you selected "Use a one-time passcode," you’ll receive an email containing the passcode to the email address to which the original encrypted message was sent. Open the email and tap the passcode.

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

    OME Viewer Passcode Email

    Sign In with your Microsoft Account

    If you've chosen to sign in with your Microsoft account, enter your email address and password, and then tap Sign In. If you don't have a Microsoft Account and would like to create one, tap Sign Up Now and complete the form.

    Sign into the OME Viewer

  4. 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. After it is downloaded, choose an app to view the attachment.

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.

  • If you see a "We didn't find a Microsoft account" message, make sure you typed your email address correctly. If you don't have a Microsoft account, you can create one or choose the Use a one-time password option.

  • 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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