Having had a few encounters with the latest infestation of the Internet, the KLEZ virus/worm, I found this blurb from The Bat’s website comforting.
“The Bat! is invulnerable to KLEZ, an e-mail worm that does not require the email receiver to open the attachment for it to execute. It uses a known vulnerability in Internet Explorer-based email clients (Microsoft Outlook, Microsoft Outlook Express) to execute the file attachment automatically. This is also known as Automatic Execution of Embedded MIME type. The Bat! is very well-protected against viruses and worms that spread via email. The Bat! doesn’t use the Windows address book and Windows-dependent HTML viewer, which have been the targets of many recent attacks. The Bat! warns the user before opening suspicious attachments or even blocks them completely.”