Phishing email messages, websites, and phone calls are designed to steal money. Cybercriminals can do this by installing malicious software on your computer or stealing personal information off of your computer. Cybercriminals also use social engineering to convince you to install malicious software or hand over your personal information under false pretenses. They might email you, call you on the phone, or convince you to download something off of a website. Source: http://www.microsoft.com/security/online-privacy/phishing-symptoms.aspx
A lot of companies are struggling to deal with cybercrime because some of it is brought onto the organisation’s network unknowingly.