UPDATED 21/01/10: Microsoft will issue an emergency patch today by 6pm
The exploit used against Google in China that affects Internet Explorer has now been made public.
IE 6, 7 & 8 are affected, however IE8 does offer limited protection.
We are advising all our customers to ensure they are running IE8 or better still, an alternative browser such as firefox until a fix is released.
More about the story can be found on this BBC News article.