CHAPTER 10 IN THIS CHAPTER . Microsoft's Trustworthy Computing Initiative . Securing Your Windows Environment . Exchange Server 2010 Client- Level Security Enhancements Client-Level Secured Messaging W hen discussing the broad topic of securing a messaging environment, it is best to break the subject down to three basic components: client-level, server-level, and transport- level security. You have likely heard the adage "A chain is only as strong as its weakest link;" this saying can easily be applied to an organization's security measures. If you have exceptionally good client-level security, and exceptionally . Securing Outlook 2007 . Protecting Against Spam . Securing Outlook Web App