Recently I was just siting around, not really doing anything at all when all of a sudden around 1200 emails poped into by mailbox within less than 1 minute.
They were all warnings sent from my company's anti-virus surveillance system, the virus it was warning about was one called Conficker.AD.worm.
Within virtually no time at all it had spread through that entire site, infecting hundreds of computers, bypassing the anti-virus software.
Luckily though there is a hotfix from microsoft available that I suggest you all make sure you have installed to avoid this.
The virus is very hard to remove once you're infected and it puts heavy load on your WAN, and infects your computer with even more spywares that it automatically downloads from hundreds of different sites.
You can read more info about the virus and the hotfix on microsofts website here
Here's a display of my inbox after the virus attack
