There's nothing worse than finding out your business website has been hacked and is being used to send out bulk emails, spam visitors, or spread malicious software.
If it hasn't happened to you, don't fall into the trap of thinking that this scenario is something that happens to other people. Spam hacks are absolutely rampant.
Fortunately, the business model of spammers requires them, more often than not, to automate their hacks to seek out vulnerable Web servers and sites, because they have to do things on a huge scale to turn a profit.