It looked weird because it claimed to be from the admin of my own web site (& I am that admin :-)
So I carted the zip to an isolation PC & took a look at it. Seems it is a *.html page in the zip & when opened all you see is a black dot in the middle
But,
Then you can expect to see the network lights start flashing like crazy.
As far as I can tell it is a variation of the script kiddie mail accounts hack - It possibly send mail out to everyone on an Exchange mail list.
Am not sure it is damaging but it sure was packaged up in a way to get past more peoples defences.
Cheers
Doug
(PS Isolation machine is a WinXP Home edition box with up-to-date security :-)