Microsoft spent $6B and five years on Windows Vista — and users begged for XP back

Windows Vista, released in January 2007 after five years of development and an estimated $6 billion in costs, was supposed to be the successor to the beloved Windows XP. But the product was plagued by problems: it demanded more powerful hardware than most PCs had, its User Account Control generated constant permission prompts, and its DRM features restricted what users could do with their own media.

The backlash was severe. Enterprise customers refused to upgrade, staying on XP for years. Consumers complained about performance, compatibility and the nagging prompts. PC manufacturers began shipping 'Vista Capable' stickers on machines that could barely run the OS, leading to a class-action lawsuit.

Microsoft spent years undoing Vista's damage. Windows 7, released in 2009, was essentially 'Vista done right' — the same core with the annoyances removed. Vista became the definitive example of how a product can be technically ambitious but practically hostile, and how a single bad release can damage a platform's trust for years.