Microsoft plans to release nine bulletins on Tuesday that cover 21 vulnerabilities across its wide portfolio of products. Of the nine bulletins, four have been tagged with the software giant's critical rating, meaning they should be given the utmost importance with regard to the overall patching process exercised by users and organizations. The four critical updates address vulnerabilities in Microsoft's Internet Explorer browser, its Windows operating system, and Silverlight. As for the remaining five updates, Microsoft has labeled them as being important. Those will cover issues foun...