Short description of MessageLock for Outlook 2007/2003/XP/2000 1.10.501: MessageLock for Outlook provides integrated email encryption and a zip file compression, all rolled into one useful utility. MessageLock provides 1-click encryption of email messages and file attachments within Microsoft Outlook. It combines strong U.S. Gov't approved AES-256 bit encryption with the universal compatibility of the Zip file utlity. MessageLock delivers encryption and compression for your message and/or file attachment.