From Altair BASIC to Azure and AI: how Microsoft reinvented itself across five decades
Microsoft’s first product was not Windows, Office or a PC. It was a BASIC interpreter written for the Altair 8800 in 1975 by two young programmers who believed software would become a major industry of its own.
Bill Gates and Paul Allen built that first program after seeing the Altair on the cover of Popular Electronics. Their partnership became Microsoft, a name Gates used in a 1975 letter as “Micro-soft”, combining microprocessors and software.
What followed was a sequence of platform shifts: programming languages, PC operating systems, Windows, productivity software, enterprise servers, gaming, cloud computing, subscriptions and artificial intelligence.
As of 18 September 2026, Satya Nadella remains Microsoft’s chairman and chief executive. Azure has become a core growth engine, Microsoft 365 has turned Office into a subscription platform, and Copilot and other AI products now sit at the centre of the company’s strategy.
Microsoft began with Altair BASIC
Gates and Allen were inspired by the MITS Altair 8800, one of the earliest commercially important personal computers.
They created a version of BASIC for the machine and sold it to MITS. Microsoft’s official history identifies BASIC as the company’s first product and MITS as its first customer.
The early company was based in Albuquerque, New Mexico, close to MITS. It developed programming languages for the growing range of microcomputers appearing in the late 1970s.
The IBM PC changed Microsoft’s scale
A defining opportunity arrived when IBM entered the personal-computer market.
Microsoft supplied the operating system for the IBM PC, launched in 1981. MS-DOS became central to the rapidly expanding ecosystem of IBM-compatible computers.
This business model proved extremely important. Microsoft did not need to build the PCs itself. Hardware manufacturers could produce compatible machines while licensing Microsoft software.
That separation between hardware vendors and the operating-system platform helped Microsoft scale across the PC industry.
Windows turned the PC into a graphical platform
Microsoft shipped the first retail version of Windows in November 1985 as a graphical environment extending MS-DOS.
Later versions transformed Windows into the dominant consumer and business desktop platform across a wide variety of PC hardware.
Windows 3.0 in 1990 and Windows 95 in 1995 became major milestones. The Start menu, taskbar and broader graphical environment made Windows increasingly accessible to mainstream users.
Microsoft’s power came not only from the operating system but from the software ecosystem built around it.
Office became the second great Microsoft franchise
Microsoft had developed applications such as Word and Excel separately before combining productivity software into Office.
The suite created a standard set of tools for documents, spreadsheets, presentations and business communication.
Windows and Office reinforced one another. Businesses standardised on Windows PCs partly because of application compatibility, while Office benefited from the enormous installed Windows base.
That combination made Microsoft a central supplier to corporate IT for decades.
The company expanded into servers, development tools and the internet
Microsoft’s reach broadened through Windows Server, SQL Server, development tools and enterprise software.
The rise of the internet forced another strategic change. Microsoft had built its power around the desktop, but browsers and web applications threatened to move important computing functions away from Windows.
The company responded with Internet Explorer, web technologies and later a much larger shift towards online services.
Xbox took Microsoft into console gaming
Microsoft launched the first Xbox in 2001.
Gaming gave the company a hardware platform of its own and eventually created a large ecosystem around Xbox consoles, Xbox Live, Game Pass and game publishing.
The business expanded substantially through acquisitions, including Mojang, ZeniMax Media and Activision Blizzard.
By 2026, Microsoft had reorganised its gaming operation under the XBOX name and was increasingly treating games as a service and content business that reaches multiple devices rather than only one console.
Cloud computing forced another reinvention
The rise of cloud computing challenged Microsoft’s traditional model of selling software licences installed on customer-owned PCs and servers.
Azure became the company’s response. Rather than relying only on Windows Server licences, Microsoft began selling computing, storage, databases, networking and software platforms as cloud services.
Office changed too. Microsoft 365 transformed productivity software into a subscription service that could span PCs, phones, browsers and cloud collaboration.
This transition reduced the company’s dependence on one Windows release cycle and created recurring revenue across enterprise and consumer customers.
Satya Nadella shifted Microsoft towards cloud and platforms
Satya Nadella became chief executive in 2014 after previously leading Microsoft’s cloud and enterprise group.
Under Nadella, Microsoft became more willing to support competing platforms and open technologies. Office expanded across iOS and Android, Microsoft embraced Linux in Azure and the company acquired GitHub in 2018.
The strategic message shifted from protecting Windows at all costs to providing Microsoft services wherever customers wanted to work.
Nadella later became chairman as well as CEO.
AI became the next platform battle
Microsoft had invested in artificial intelligence for years, but generative AI pushed the technology to the front of its strategy.
The company integrated Copilot experiences across Microsoft 365, Windows, GitHub and its enterprise stack, while Azure became a major platform for training and running AI models.
By its 2026 fiscal year, Microsoft said Azure revenue had passed US$100 billion for the first time and Microsoft 365 Copilot had exceeded 30 million paid seats.
Those figures show how the company is attempting to repeat an old Microsoft pattern: turn a major technology transition into a platform used by developers, businesses and end users.
Microsoft’s history is a story of platform transitions
The most important Microsoft products have often been platforms rather than isolated applications.
MS-DOS gave software developers a common target across compatible PCs. Windows expanded that environment into a graphical platform. Office standardised productivity software. Azure supplies infrastructure and developer services, while Microsoft 365 connects collaboration and applications through the cloud.
AI is now being layered across those existing platforms rather than treated as a completely separate business.
How Microsoft became what it is today
Microsoft survived several moments when the technology industry moved away from the environment that had made it powerful.
The company began in programming languages, found enormous scale through PC operating systems, built Office into a second franchise, entered gaming and enterprise software, then rebuilt much of its business around cloud subscriptions.
Its current AI strategy sits on top of that accumulated infrastructure. Microsoft controls operating systems, productivity software, developer tools, cloud data centres, enterprise relationships and a large gaming business.
As of 18 September 2026, Satya Nadella remains chairman and CEO, and Microsoft is again trying to shape a computing transition rather than merely adapt to it.
For TechnologyBlog.co.za, this history article can serve as the cornerstone link for future Windows, Surface, Xbox, Azure, Microsoft 365, Copilot and company-news coverage.
Primary sources checked include Microsoft’s official history series, Microsoft corporate facts and current Microsoft investor material. Information reflects public material available on 18 September 2026.