http://blogs.msdn.com/biztalkbre/archive/2006/10/11/What-is-the-difference-between-Microsoft.RuleEngine.RuleSetDeploymentDriver-and-Microsoft.BizTalk.RuleEngineExtensions.RuleSetDeploymentDriver_3F00_.aspxThe Microsoft.RuleEngine assembly can be used by any .NET application. The BizTalk Server can be considered as one of the consumers of BRE. The Microsoft.BizTalk.RuleEngineExtensions is the extension for BizTalk to provide some additional functionality.enCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/biztalkbre/archive/2006/10/11/What-is-the-difference-between-Microsoft.RuleEngine.RuleSetDeploymentDriver-and-Microsoft.BizTalk.RuleEngineExtensions.RuleSetDeploymentDriver_3F00_.aspx#830484Mon, 16 Oct 2006 07:11:55 GMT91d46819-8472-40ad-a661-2c78acb4018c:830484Infosys | Microsoft<p>Recently when trying to work programmatically with BizTalk rules, I noticed that the RuleSetDeploymentDriver class appears twice, once in the Microsoft.RuleEngine namespace and once in Microsoft.BizTalk.RuleEngineExtensions. Not able to figure out what</p>