Microsoft Outlook Security Notice Through Citrix XenApp 6.5

Sometimes we need to open links we receive in Outlook but because of malicious sites out there, we have to find a way to prevent opening links from unknown sources.

The problem users have when clicking on these hyperlinks is Outlook 2010 will pop up with a Security Notice notifying you that there is a potential security concern with the hyperlink the user is clicking on. You either click on Yes or No to continue. Most users will brush this off and just click Yes because they want to open the link.

Microsoft Outlook Security Notice

Then it becomes an annoyance if the user is opening many links.

Adding the hyperlink to Trusted Sites did not fix the issue. Or modify the Macro settings. I would try these first before trying the following solution.

I had to troubleshoot this on a Citrix XenApp session but the solution will work on a local install of Outlook 2010 on Windows 7.

If you aren’t using Citrix XenApp, then ignore this step.

Log onto the Citrix XenApp server that the user’s app session is on that is receiving the Microsoft Outlook Security Notice.

Open the Registry Editor and navigate to the following key:


If you do not see the subkey “Security” under the “Common” key then you will have to create it.

Within the Security key, create a new Reg_DWORD called “DisableHyperlinkWarning” with a value of 1:

DisableHyperlinkWarning DWORD

In my scenario, no restart was necessary.

About Rowell Dionicio

I am Rowell Dionicio, a network engineer with a coffee addiction, an advocate of WordPress, with a passion about networking and wireless. I am part of the Cisco Champion program and my purpose is to help you become a better engineer. Follow me on Twitter, LinkedIn, Facebook and YouTube.