There is an eMail out right now claiming a System Upgrade to your Mail System, it is requiring you to click on a link and install a program.  This is a VIRUS!  No Mail System requires you to do an upgrade on your system, upgrades are done on the server which is not your computer.

Below is the email, the bad link has been dissabled.

Attention!

  On October 22, 2009 server upgrade will take place. Due to this the system may be offline for approximately half an hour.
The changes will concern security, reliability and performance of mail service and the system as a whole.
For compatibility of your browsers and mail clients with upgraded server software you should run SSl certificates update procedure.
 This procedure is quite simple. All you have to do is just to click the link provided, to save the patch file and then to run it from your computer location. That's all.

http://updates.yourwebsite.secure.secure-admins.org/ssl/id=72438260-youremail-patch672.aspx

 Thank you in advance for your attention to this matter and sorry for possible inconveniences.

 System Administrator