Just came across a story that quotes the National Crime Agency as saying that a mass spamming event may be taking place aimed primarily at small businesses. The attachment if opened will lock your computer with a demand of 2 Bitcoins (£536) for the decryption key.
Full story: http://www.dailymail.co.uk/news/arti...me-Agency.html
While I am sure most of you would not fall for this type of scam it might be prudent to be extra vigilant while this threat is there.