Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
imapsync - Console-based utility for migrating IMAP mailboxes.
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).
MailStore - MailStore Home - A 100% free single-private-user desktop solution
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.
Fetchmail - The Fetchmail Project