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copied!<p>Here are some questions for troubleshooting:</p> <ul> <li>What kind of add-in are you developing? A Shared Add-in or a VSTO? If VSTO which version?</li> <li>What OS are you using? Vista can be tricky...</li> <li><p>Check the LoadBehavior of your add-in in the Registry. You find the value either in</p> <pre><code>HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Word\Addins\<add-in class name>\ </code></pre> <p>or </p> <pre><code>HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\Word\Addins\<add-in classname>\ </code></pre></li> </ul> <p>If the value of LoadBehavior is 2 your add-in has been disabled during startup. This happens when Word cannot instantiate the add-in, typically because the add-in throws an unhandled exception, or - much more often - because the add-in is not correctly registered.</p> <p>Have you checked that the VSTO runtime is correctly installed on the target system?</p> <p>However, even if you use VSTO, for Word the add-in still looks like a classic COM add-in which is extending the classic IDTExtensibility2 interface. Such add-ins must be registered the following way:</p> <ul> <li>One of the two registry keys above to tell Word the class name of the add-in plus additional information such as the load behavior and a description</li> <li><p>The class name of the add-in must be registered under</p> <pre><code>HKEY_CLASSES_ROOT\<add-in classname>\CSLID </code></pre></li> <li><p>The correct version of the COM component must be registered under (where {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} is the guid of the component as specified under HKEY_CLASSES_ROOT\\CSLID): </p> <pre><code>HKEY_CLASSES_ROOT\CLSID\{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} </code></pre></li> </ul> <p>The following two links might also help you further narrowing down your problem:</p> <blockquote> <p><a href="http://www.mztools.com/articles/2007/MZ2007009.aspx" rel="nofollow noreferrer">HOWTO: Troubleshooting Visual Studio and Office add-ins</a></p> <p><a href="http://blogs.msdn.com/dvespa/archive/2008/10/15/troubleshooting-outlook-com-addins-using-procmon.aspx" rel="nofollow noreferrer">Troubleshooting Outlook COM Addins – Using ProcMon</a></p> </blockquote>

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