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Office document attachments in Outlook unexpectedly open in Protected View mode
Article ID: 2714439 - View products that this article applies to.
This file originated as an e-mail attachment and might be unsafe. Click for more details.This warning is shown in the following figure.
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This problem occurs even though the e-mail message was sent to you by another user in your organization (using Microsoft Exchange Server).
This problem occurs when the MarkInternalAsUnsafe DWORD value exists under either of the following registry keys and has a value of one (1).
To resolve this problem, make the change that is appropriate to your situation.
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:
(https://vkbexternal.partners.extranet.microsoft.com/VKBWebService/ViewContent.aspx?PortalId=1&scid=kb;en-US;322756)How to back up and restore the registry in Windows
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Files from the Internet and from other potentially unsafe locations can contain viruses, worms, or other kinds of malware, which can harm your computer. To help protect your computer, files from these potentially unsafe locations are opened in Protected View. However, if the e-mail message with the Office document attachment originates from within your own Microsoft Exchange Server organization, the attachments will only open in Protected View if you have MarkInternalAsUnsafe=1 in the registry, which is not the default Office configuration. The default behavior is to not open Office document attachments in Protected View if the e-mail message originates inside your own Exchange organization.
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.