Mailwasher - Over 8 million people use MailWasher as their spam filter
Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
SPAMfighter - SPAMfighter and Microsoft have built the strongest and most effective anti spam filter for Outlook, Windows Live Mail, Outlook Express & Thunderbird
Symantec Data Loss Prevention - Fully protect your data with the comprehensive detection technologies and unified policies of Symantec's industry leading Data Loss Prevention (DLP).
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.