The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Happened as dated, per the pin description: "Windows 8.1 Release Date. Freatures New Bings Apps…"
Microsoft's own news site confirms the rollout: "Beginning Oct. 17, consumers with a Windows 8 device in more than 230 markets and 37 languages can download the free update," matching the pin's stored 17 October 2013 date exactly.
Windows Central's headline, "Official: Windows 8.1 to be released on October 17th," backs the pin's date, though the article was published 14 August 2013, two months ahead of the actual release, as an early advance report rather than same-day coverage.
Something missing or wrong? Say it in your own words: a link that backs this pin up, a different start or end date and why, or a fact it lacks or gets wrong. The AI checks it against this pin's sources, searches for better ones, and adds any page that backs you up. The pin's own sources still count most. A picture that shows something else, or shows it badly, is looked at too, and moved down or replaced.
