[8] A group of clients put up the original capital for the company - £30,000 - and an order was placed for an ICL 1902 computer, which didn't arrive in New Zealand for another year.

[9] In 1970, Hargreaves quit his family's accounting firm to run CBL full-time, and the business expanded to Auckland via the acquisition of the Fletcher Computer Bureau.

Datacom merged with computer-services company CCL (not to be confused with the Spark subsidiary Computer Concepts Limited) in 1989, added its facilities management and payroll technology to its already established payroll division[9] In 1991, Datacom signed its first large outsourcing contract in Auckland with Telecom Directories.

Datacom began exporting some of its facilities management and IT services into its Australian offices in the late 1990s, leading to the company's first data centre in Australia.

[14] Datacom commenced business in Asia in 1994, building contact centres in Malaysia in 1996, and the Philippines in 2008, at the same time establishing a presence in China.

[19] In 2013 Datacom also sold the contact centre arm of its Asia business,[9] but continued to serve the market with IT services.

[26] In March 2015, Datacom won the Australian Federal Department of Health support services contract after a competitive tender process.

The $242 million, five-year deal will see Datacom providing technology infrastructure and support services under a fully managed, consumption-based model.

[28] In November 2015, Microsoft Australia announced Datacom as one of the latest partners to join its one-tier Cloud Solution Provider (CSP) program, which allows them to own the billing for products such as Office 365.

[35] Datacom completed Australia's first migration of SAP HANA into AWS, by taking $800 million-turnover resources company Oz Minerals into the cloud in early 2017.

[37] Ladd became the Chairman of the International Business, and Greg Davidson formally took over the Group CEO role on March 31, 2018, alongside a new leadership team and organisational structure.

[38] The Datacom Foundation was established in 2019 to provide long-term support for the children of families affected by the Christchurch Mosque Shootings and help them build a brighter future through education.

In July 2022, Datacom secured a four-year contract with Transport for NSW to provide network operations and a high-speed digital ecosystem to support customer service.

Full-year operating cash flow remains strong at $139 million, and the business continues to perform with low debt levels.