In 2004, founding chief executive officer Steve Chang decided to split the responsibilities of CEO and chairman of the company. Company co-founder Eva Chen succeeded Chang as chief executive officer of Trend Micro in January 2005. Chen had most recently served as the company's chief technology officer since 1996 and before that executive vice president since the company's founding in October 1989. Chang retained his position as company chairman. In May, Trend Micro acquired Braintree, Massachusetts-based antispyware company InterMute for $15 million. Trend Micro had fully integrated InterMute's SpySubtract antispyware program into its antispyware product offerings by the end of that year. In June 2005 Trend Micro acquired Kelkea, a San Jose, California-based developer of antispam software. Kelkea developed Mail Abuse Prevention System (MAPS) and IP filtering software that allowed internet service providers to block spam and phishing scams. Kelkea chief executive officer Dave Rand was retained by Trend Micro as its chief technologist for content security.