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 tomshardware.com: "…leaker WZor that Microsoft[2] may actually start talking about Windows 9 "Threshold" during the Worldwi…"
Microsoft's own newsroom describes the Worldwide Partner Conference taking place in Washington, D.C. on 14-15 July 2014, referencing "yesterday" in a piece published 15 July - squarely inside the pin's stored 12-18 July window.
PR Newswire states the Worldwide Partner Conference ran 13-17 July 2014 in Washington, D.C. with over 16,000 attendees and a keynote from new CEO Satya Nadella, closely matching the pin's stored 12-18 July window.
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.