A computer on every desk
Gates and Allen had a vision of a computer in every home. A deal with IBM to supply the DOS operating system for the IBM PC brought them enormous success, because they kept the right to sell it to other manufacturers as well.
Windows and Office
Windows and the Office suite became the standard in offices. In 2001 Microsoft lost an antitrust case in the USA over tying its web browser to Windows.
A new era
Under Satya Nadella, Microsoft focused on the Azure cloud, bought GitHub and LinkedIn, owns Xbox and invested heavily in OpenAI. The Copilot AI assistant is now part of both Windows and Office.