@HotFix: Thanks for the feedback. We frequently get questions about specific updates, particularly the ones that are critical enough to be released "out-of-band" (i.e. between the scheduled monthly updates). Questions such as: does this apply to Exchange Server/Windows Server version xxxx? do I need to apply it on CAS only, or all servers?
This update also deserves special attention because it was released during a period when many are away celebrating and may have missed it.
If you proactively review security bulletins and apply updates, you're good. If a security update has been released by Microsoft, you can apply it to affected servers. This post is not a sign-off and no sign-offs are required.
We've previously blogged about another security update (see http://blogs.technet.com/b/exchange/archive/2010/09/23/3411149.aspx), and will continue to do so as required to address customer questions.