In 2004, founding chief executive officer Steve Chang decided to split the responsibilities of CEO and chairman of the company.[7] Company co-founder Eva Chen succeeded Steve Chang as chief executive officer of Trend Micro in January 2005.[5] 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.[5] Steve Chang retained his position as company chairman.[5] In May, Trend Micro acquired Braintree, Massachusetts-based antispyware company InterMute for $15 million.[10] Trend Micro had fully integrated InterMute’s SpySubtract antispyware program into its antispyware product offerings by the end of that year.[10][11] In June 2005 Trend Micro acquired Kelkea, a San Jose, California-based developer of antispam software.[12] Kelkea developed Mail Abuse Prevention System (MAPS) and IP filtering software that allowed internet service providers to block spam and phishing scams.[13] Kelkea chief executive officer Dave Rand was retained by Trend Micro as its chief technologist for content security.