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Office document attachments open in Protected View in Outlook

Symptoms
When you open a Microsoft Office document that's attached to an Outlook email message, the document opens in Protected View. Additionally, the following notification is displayed at the top of the document.
  • Outlook 2013

    Be careful - email attachments can contain viruses. Unless you need to edit, it's safer to stay in Protected View.

    The screenshot of the notification in Outlook 2013

  • Outlook 2010

    This file originated as an e-mail attachment and might be unsafe. Click for more details.


    The screenshot of the notification in Outlook 2010

This problem occurs even though the email message was sent to you by another user in your organization (through Microsoft Exchange Server).
Cause
This problem occurs when the MarkInternalAsUnsafe DWORD value is set to 1 under either of the following registry keys.

HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook\Security
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\x.0\Outlook\Security

Note The x.0 placeholder represents the version of Outlook that you're using (Outlook 2013 = 15.0, Outlook 2010 = 14.0).
Resolution
To fix this problem, use one of the following methods, as appropriate for your situation.

Important Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.

  • Set the MarkInternalAsUnsafe value to 1 under HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook\Security.

    To have us update the MarkInternalAsUnsafe value for you, go to the "Fix it for me" section. If you prefer to update the value yourself, go to the "Let me fix it myself" section.

    Fix it for me

    To update the value of MarkInternalAsUnsafe automatically, click the Fix it button or link. Then click Run in the File Download dialog box, and follow the steps in the Fix it wizard.

    Note The following "Fix it" solution supports Outlook 2010 on Windows 7 or Windows Vista. If you are using a different version of Outlook or a newer version of Windows, follow the steps in the "Let me fix it myself" section.




    Notes
    • This wizard may be in English only. However, the automatic fix also works for other language versions of Windows.
    • If you are not on the computer that has the problem, save the Fix it solution to a flash drive or a CD, and then run it on the computer that has the problem.

    Then, go to the "Did this fix the problem?" section.



    Let me fix it myself

    To update the value of MarkInternalAsUnsafe, follow these steps:
    1. Exit Outlook.
    2. Start Registry Editor:
      • In Windows 8 or Windows 8.1, press the Windows Key + R to open a Run dialog box. Type regedit.exe, and then press OK.
      • In Windows 7 and Windows Vista, click Start, type regedit in the Start Search box, and then press Enter.
      • In Windows XP, click Run on the Start menu, type regedit, and then click OK.
    3. Locate and then select the following registry subkey:

      HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook\Security

      Note The x.0 placeholder represents the version of Outlook that you're using (Outlook 2013 = 15.0, Outlook 2010 = 14.0).
    4. Double-click the MarkInternalAsUnsafe DWORD value.
    5. Change the value from 1 to 0, and click OK.
    6. Restart Outlook.
  • Set MarkInternalAsUnsafe to 1 under HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\x.0\Outlook\Security.

    In this configuration, the MarkInternalAsUnsafe value is located under the Policies hive in the registry. Therefore, your system administrator must disable the Use Protected View for attachments from internal senders policy in the Group Policy Management Console, as follows:
    1. Start the Group Policy Management Console.
    2. Expand the Microsoft Outlook 2013 or Microsoft Outlook 2010 node, and then select Security, per the following screen shot:

      The screenshot for step 2

    3. Double-click the Use Protected View for attachments received from internal senders policy.
    4. Select Not Configured, and then click OK.

Did this fix the problem?

  • Check whether the problem is fixed. If the problem is fixed, you are finished with this section. If the problem is not fixed, contact support.
  • We would appreciate your feedback. To provide feedback or to report any issues with this solution, please leave a comment on the "Fix it for me" blog or send us an email.
More information
Files from the Internet and from other potentially unsafe locations may contain viruses, worms, and other kinds of malware, and these can harm your computer. To help protect your computer, files from these potentially unsafe locations are opened in Protected View. However, if the email message that contains the Office document attachment originates from within your own Exchange Server organization, the attachment will open in Protected View only if you have MarkInternalAsUnsafe set to 1 in the registry. This is not the default setting for an Office configuration. By default, Office document attachments are not opened in Protected View if the email message originates from inside your own Exchange organization.
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Article ID: 2714439 - Last Review: 10/21/2015 21:40:00 - Revision: 8.0

Microsoft Outlook 2010, Microsoft Outlook 2013

  • kbfixme kbmsifixme KB2714439
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