Well, yes, sort of...
SP2 provides numerous hotfixes for the XP system. Since IE ships with XP and is considered an integral PART of the OS, it too was patched and in this special case additional functionality was added.
There is a fine line between IE as a product and IE as part of the OS from Microsoft's persective. Not looking ot spurr a huge debate but I'm in agreement with Microsoft that it shoudl be considered part of the OS. An OS without a web browser is virtually useless.
I hope you find this post helpful.
Regards,
Mark