The second optional preview for the Internet Explorer Automatic Component Activation is available. This preview is compatible with the February IE Cumulative Update package. As announced earlier on this blog, the final behavior will be widely distributed in the April 2008 Internet Explorer Cumulative Update where all customers who install the update will get the change. Read Knowledge Base article 947518 for full details along with links to the specific downloads for each operating system.

Source:? Microsoft

Microsoft, IE, Internet Explorer, Automatic Component Activation, ACA