Installing the Trusted Code Control

The following is tip #8 from "20 Tips on securing Outlook in 20 minutes."

The following is tip #8 from "20 Tips on securing Outlook in 20 minutes," excerpted from a chapter in Paul Robichaux's book, Secure Messaging with Microsoft Exchange Server 2003 © 2004, published by Microsoft Press. Return to the main page for more tips on this topic.


Outlook allows you to write add-ins that are loaded into Outlook's process space; these add-ins use COM to communicate back and forth with Outlook.

Because these add-ins run in-process, it's not a good idea to run add-ins from untrusted sources.

When you install the security package, you gain the ability to create a list of trusted add-ins that clients can run without being prompted by Outlook security, provided you install the Trusted Code control. You only need this on your administrative machines; end users don't need it (and, in fact, shouldn't have it). Because the Hashctl.dll file is already installed on your machine, the only thing you really need to do is to register it, although Microsoft recommends moving the Hashctl.dll file to the \System32 folder in your Windows directory. To register the dynamic-link library (DLL), use this command:

regsvr32 hashctl.dll


Get more "20 Tips on securing Outlook in 20 minutes!" Return to the main page.

About the author: Paul Robichaux is a partner at 3sharp LLC, author of several books on Exchange, Windows, and security, a Microsoft MVP for Exchange Server and a frequent speaker and presenter at IT industry conferences. He's written software for everyone from the U.S. National Security Agency to scientists flying their experiments aboard the Space Shuttle, fixed helicopters in the desert and spent way too much time playing video games.

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