Not only do all security updates go to all users' systems, but non-genuine Windows systems are able to install service packs, update rollups, and important reliability and application compatibility updates. In addition, the users of non-genuine Windows systems can also upgrade a lot of the other software on their computer. For example Internet Explorer 8 has numerous security- oriented features and improvements, and it is available to all users.
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Not only do all security updates go to all users' systems, but non-genuine Windows systems are able to install service packs, update rollups, and important reliability and application compatibility updates. In addition, the users of non-genuine Windows systems can also upgrade a lot of the other software on their computer. For example Internet Explorer 8 has numerous security- oriented features and improvements, and it is available to all users.
http://windowsteamblog.com/windows/b/windowssecurity/archive/2009/04/27/who-gets-windows-security-updates.aspx