http://blogs.msdn.com/jingmeili/archive/2007/11/20/how-to-sign-an-infopath-form-template-with-verisign-certificate.aspxVeriSign code-signing certificate comes as 2 files including 1 certificate file (.spc) and 1 private key file (.pvk). The following describes what we had to go through at my customer to digitally sign the InfoPath form template which has the Full Trusten-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/jingmeili/archive/2007/11/20/how-to-sign-an-infopath-form-template-with-verisign-certificate.aspx#9436655Sat, 21 Feb 2009 01:43:39 GMT91d46819-8472-40ad-a661-2c78acb4018c:9436655mrackley<p>My certificate appears under the Personal Certificates store (Current User -&gt; Personal), BUT it does not appear in the list in InfoPath when I go to tools-&gt;Form Optoins-&gt;Security and Trust and click &quot;Select Certificate&quot;.</p> <p>It is a Thawte Code Signing Certificate.</p> <p>Any ideas? &nbsp;I have been fighting this all day.</p> <p>thanks,</p> <p>Mark</p>