• Microsoft confirms problems with June 2017 security patches for Outlook, provides workarounds

    Posted on June 19, 2017 at 11:12 CDT by • Comment in the Forums

    Microsoft has acknowledged that the June 2017 security patches for Office Outlook can cause Email attachment blocking problems. This affects Outlook 2007 (KB 3191898), Outlook 2010 (KB 3203467), Outlook 2013 (KB 3191938), and Outlook 2016 (KB 3191932). The description of the Security Updates comes with this warning about known issues:

    If an email message includes an attached email message, and the attached email message’s subject line ends with an unsafe file name extension as listed in the Blocked attachments in Outlook page, the email attachment will be blocked for recipients. To fix this issue, save the email message to the computer and rename its subject line so that it does not end with an unsafe file name extension. Then, attach it to the email message to be sent.

    The blocking of attachments with file extensions that are on the list is meant to protect against opening files that could be harmful to your computer. However there have been reports that other attachments such as Rich Text (.rtf) and Word and Excel are also being blocked. Microsoft has issued several workarounds for this.

    For Office 2007 and 2010 Rich Text attachments (.rtf)

    • Forward the email to yourself and then open the attachments from the forwarded email.
    • Change the email format to HTML, or Text format.
    • Save the attachments to your computer, using one of the following methods, then open them from the saved location:
      • Drag and drop the attachments to your desktop.
      • Go to File > Save Attachments.
      • Copy and paste the attachment to your computer.

    For Outlook 2007, Outlook 2010, Outlook 2013, and Outlook 2016 attachments containing consecutive periods (…) or exclmation mark (!).
    If you’re sure the attachment was sent from a trusted source, proceed to Open or Save the attachment.

    For Outlook 2013 and Outlook 2016
    If you set ShowLevel1Attach to allow Outlook to display Level 1 attachments, you may see the error: “One or more objects in this file have been disabled due to your policy settings”

    • Change the email format to HTML, or Text format.
    • Save the attachments to your computer, using one of the following methods, then open them from the saved location:
      • Drag and drop the attachments to your desktop.
      • Go to File > Save Attachments.
      • Copy and paste the attachment to your computer.

    For a complete description of the warning messages, and the workarounds Microsoft has issued, see You receive an error when opening attachments in Outlook

    @gborn is also reporting issues with Outlook after installing June 2017 security patches on Born’s Tech and Windows World

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