http://developers.de/blogs/damir_dobric/archive/2008/03/21/manipulating-security-trimmers-in-moss.aspxWhen working with search security trimmers, you will have to use stsadm tool to install the trimmer and to pair it an existing CrawlRule. Following examples show how to enlist existing security trimmers, how to register the new one and how to unregisterenCommunityServer 2008 SP1 (Build: 30619.63)http://developers.de/blogs/damir_dobric/archive/2008/03/21/manipulating-security-trimmers-in-moss.aspx#5243Tue, 05 May 2009 08:10:23 GMT7e491611-45ad-4dae-a68f-c4cb64439510:5243Elena<p>After I unregister my customer security trimmer and delete the rule, when I try to search I get &quot;System.InvalidOperationException: Could not find Pluggable Security Trimmer with Id &#39;XX&#39;. &nbsp; &nbsp; at Microsoft.Office.Server.Search.Administration.Security.PluggableSecurityTrimmerManager.Instantiate...&quot; . ANy idea what else I need to do to complete unregister it?</p> <div style="clear:both;"></div><img src="http://developers.de/aggbug.aspx?PostID=5243" width="1" height="1">