Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
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).
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.