| 1962 | Hitachi Electronics Services(DENSA) was founded as a firm whose main business was the installation and maintenance of communication equipment and computers. |
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| 1964 | The headquarters office was integrated and business operations started in earnest. |
| 1973 | The Repair Shop and Tokyo Call Center were established. |
| 1977 | DENSA was voted No.1 in the Nikkei User Survey on maintenance service, a position it has maintained virtually every year since. A stock inquiry on-line system was put into operation in the Spare Parts Managing Center. An automatic operation monitoring panel for HITAC was developed. |
| 1980 | The public relations magazine "Densa" commenced publication. An on-line connection to all sales offices was established for the "Maintenance Information Support System", the forerunner of the "ASSIST" system. |
| 1983 | The headquarters office was moved to its Sinano-cho Totsuka-ku Yokohama, and the ASSIST Center opened for business. Maintenance support commenced for Hitachi America Ltd. and Hitachi Europe Ltd. |
| 1986 | Software service business commenced. Research on failure investigation through sound analysis was carried out. |
| 1988 | Sales of computer consumables and Failure Support System operations commenced. The Call Center for OA equipment opened for business. |
| 1990 | Annual sales surpassed the 100 billion yen mark. Maintenance reception service supporting multi-vendor equipment commenced. |
| 1991 | Failure Support System HIT-2 operations commenced. Portable terminal operation of the work instruction/report creation support system commenced. |
| 1992 | The company established the Koto Ward Logistics. The Spare Parts Delivery/Shipping Support System(Replenishment Delivery Function)commenced operations. The Call Centers opened. |
| 1994 | The Ebisu Logistics Center opened. The Learning Support System "HIPLUS" commenced operations. |
| 1995 | The entire company worked diligently to repair systems damaged in the Great Hanshin-Awaji Earthquake, receiving thank-you letters from its customers and from the parent company Hitachi, Ltd. for its efforts. |
| 1996 | The Solution Service Operation Center opened. Remote operations commenced for the C/S Operation Management Proxy Service and System Failure Monitoring Service. |
| 1997 | DENSA acquired ISO9002 certification for maintenance service business. |
| 1999 | Installation work was added as a category to the ISO9002 certification and DENSA acquired ISO9001 certification. |
| 2000 | New Kyushu Regional Office building was built in Hakata, Fukuoka. The new presentation center "DENSA Solution Plaza" was established in Omori, Tokyo. New Chugoku Region office building established in Hiroshima. |
| 2001 | DENSA symbol logo mark established. "License acquisition campaign" enacted, encouraging all employees to acquire at least one licensed certification. Hitachi Electronics Services Group acquires environmental ISO 14001 certification. "HIPLUS on Web", conforming to international e-learning standards, created. "IT Management Service" in cooperation with Hitachi, Ltd., goes on public sale. Logistics Center centralized in Ecchujima, Tokyo. |
| 2002 | Five support centers integrated to form Hitachi Solution Support Center in Tokyo. Densa entered into on MSP business tie-up with siteROCK K.K. |
| 2003 | Obtained ISO 9001:2000 certification, ISMS certification, and permission to use the Privacy Mark. |
| 2004 | COPC-2000® CSP Base Standard certification acquired. |
| 2005 | BS15000-1：2002 certification obtained. Merged with Hitachi Open Platform Solutions, Ltd. Commenced offering "integrated support services" combining hardware and software over the life cycle of information systems. |
| 2006 | Six group subsidiaries-Nissei Hitachi Electronic Services, Kansai Hitachi Electronic Services, Chubu Hitachi Electronic Services, Ibaraki Electronic Services, Chugoku Electronic Services and Tohoku Electronic Services-merged with DENSAContinued to strengthen enhanced one-stop setup, together with high-efficiency business. Introduced an operating officer system.Acquired ISO/IEC20000 certification. Head office function moved to Mita office, Tokyo. |
| 2007 | Field Service Management System commences all over Japan. DENSA receives CRM Best Practice Award 2007. Logistics Centers for BCM open in Nagoya and Hiroshima. Presentation center "Densa Solution square Kansai" open in Kansai Regional Office. |
| 2008 | Densa voted No.1 in system operation-related service category(for information service companies)in Nikkei Computer magazine's 13th reader survey on customer satisfaction. Densa awarded "BCAO Award 2007, Excellent Performance Award" in recognition of the Business Continuity Management(BCM)System. Densa awarded "the 26th IT Business Award, IT Business Innovation Award" hosted by Japan Institute of Information Technology. |
| 2009 | Hokkaido Hitachi Solutions Co., Ltd., Hitachi Shikoku Solutions, Ltd., and Kyushu Hitachi Solutions Co., Ltd., merged as subsidiaries. DENSA established Hitachi Control Center at Hitachi's third Yokohama Data Center. Merged with Hitachi HBM Co., Ltd. Offering of "Integrated support services and solutions" commences. Densa presented the Minister of Economy, Trade, and Industry's Award for Contributions to Information Society for FY 2009 Informatization Month. Densa presented the Minister of Education and Science's Award for earning the FY 2009 business telephone certification. Life Cycle Solution Center established for one-stop handling and support of customer ICT equipment. |
