How to Unblock Unsafe Attachments in Microsoft Outlook

“Outlook blocked access to the following potentially unsafe attachments” message in Outlook.

When you receive an e-mail in Microsoft Outlook that contains an attachment, you might receive the following message at the top of the message or of the Reading Pane:

Outlook-blocked-potential-unsafe-attachments

Outlook blocked access to the following potentially unsafe attachments: []

All versions of Outlook since Outlook 2000 Service Release 1 (SR1) include a security feature that blocks attachments that might put your computer at risk for viruses or other threats. Although Outlook blocks access to the attachment, the attachment still exists in the e-mail message.
This article describes methods that you can use if you have to open an attachment that is blocked in Outlook. Additionally, this article contains information about the kinds of attachments that Outlook blocks.

Customize attachment security behavior

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

322756 How to back up and restore the registry in Windows

Important Before you can customize the attachment security behavior in Outlook 2000 SR1 and Microsoft Outlook 2000 SR1a, you must first apply either Microsoft Office 2000 Service Pack 2 or Microsoft Office 2000 Service Pack 3.
Follow these steps to modify the registry and change Outlook’s attachment security behavior.

  1. Exit Outlook if it is running.
  2. Click Start, and then click Run. Copy and paste (or type) the following command in the Open box, and then press ENTER:

    regedit

  3. Verify that the following registry key for your version of Outlook exists.
    Microsoft Office Outlook 2010

    HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Security

    Microsoft Office Outlook 2007

    HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security

    Microsoft Office Outlook 2003

    HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security

    Microsoft Outlook 2002

    HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Security

    Microsoft Outlook 2000

    HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Outlook\Security

    If the registry key exists, go to step 5.
    If the registry key does not exist, follow these steps to create it:

    1. Locate, and then click the following registry key:

      HKEY_CURRENT_USER\Software\Microsoft

    2. Under Edit, click New, and then click Key.
    3. Type Office, and then press ENTER.
    4. Under Edit, click New, and then click Key.
    5. For Outlook 2010, type 14.0, and then press ENTER.
      For Outlook 2007, type 12.0, and then press ENTER.
      For Outlook 2003, type 11.0, and then press ENTER.
      For Outlook 2002, type 10.0, and then press ENTER.
      For Outlook 2000, type 9.0, and then press ENTER.
    6. Under Edit, click New, and then click Key.
    7. Type Outlook, and then press ENTER.
    8. Under Edit, click New, and then click Key.
    9. Type Security, and then press ENTER.
  4. Under Edit, click New, and then click String Value.
  5. Copy and paste (or type) the following name for the new value:

    Level1Remove

  6. Press ENTER.
  7. Right-click the new string value name, and then click Modify.
  8. Type the file name extension of the file type that you want to open in Outlook. For example:

    .exe

    To specify multiple file types, use the following format:

    .exe;.com

  9. Click OK.
  10. Exit Registry Editor.
  11. Restart your computer.

When you start Outlook, you can open the file types that you specified in the registry.
Note We recommend that you enable only the file types that you have to have. If you rarely receive a particular file type, we recommend that you give Outlook temporary access to the file type that is in question. Then, reconfigure Outlook to block the file type by undoing the changes to the registry. For more information about how you can configure Outlook to block attachment file name extensions that Outlook does not block by default, click the following article number to view the article in the Microsoft Knowledge Base:

837388 How to configure Outlook to block additional attachment file name extensions.

Still not able to access the attachment, then it’s Microsoft Office Security Updated.

As, max of my client using MS Office 2010 & MS Office 2013, able to identify only solution for same version.

MS Office 2010

Remove the Security Update for Microsoft Outlook 2010 KB3203467

MS Office 2013

Remove the Security Update for Microsoft Outlook 2010 KB3191938

Restart Microsoft Outlook & Done.

Enjoy!

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