Optional update KB2463332 (Windows Internal Database SP4) on SBS2011

Hi,

The update KB2463332 is being offered as an optional update on our SBS 2011 server. This seems to be for SQL Server 2005 which isn't installed on the server. The internal datase on SBS 2011 is SQL Server 2008 Express isn't it. Just wondering why this update is appearing, and whether I should install it? I see other questions in the forum to resolve problems after installing it..

Thanks.