This email will self-destruct in 5 seconds...

The BBC reports that Microsoft Office 2003 has a new feature, the lemming email, which can be set by the sender to delete itself after a specified time period - and which can be prevented from being forwarded or even printed. A free Office Viewer will be available for those who don't run Office but receive a lemming mail.

The big question is: will anyone use it? Many companies have a policy or regulatory requirement to retain emails for a certain time period. I bet some of these people will love it, though...