Microsoft’s 1999 market capitalization record exceeded $600 billion during the dot-com era.
Microsoft’s market value rose above $600 billion in late 1999, making it the world’s most valuable company at the height of the technology-stock boom. The valuation was driven by the widespread use of Windows and Office and by investor optimism about the future of software and the internet.
The record was set before the dot-com bubble burst in 2000. Technology shares then experienced a major decline, and Microsoft’s market capitalization fell substantially from its peak. Such episodes show that market capitalization measures current expectations as well as present business performance.
Microsoft later rebuilt its market value through a shift toward enterprise services and cloud computing. Azure, Office 365, LinkedIn, gaming, and other businesses broadened the company beyond its original desktop-software model.