"I would like to remind people that contacting us with abusive e-mail messages is in fact illegal and we will be taking the appropriate steps to forward these messages and information gathered to both the relevant ISP’s and law enforcement agencies. "

From what I understand, from doing some research, this is not necessarily the case. Threatening someone would be illegal, harassment as well - but profanity for the most part is not illegal in most places (though there are certain states and countries that do have profanity laws). Additionally, "abusive" is a term that can be quite broad, and in certain cases it could definitely be a judgement call on how one person might see it compared to someone else. I'm not saying people should go cursing out any one they have a complaint with, but at the same time if you are dealing with customer support, you need to have thick skin and patience - and if necessary then cancel the business relationship with the customer, but don't go pulling the legal card on an unhappy customer in every case.