On November 6, 2003, Apple set a new record for digital music sales: 1.5 million downloads in one week, thanks to iTunes on Windows.
(via Cult of Mac - Your source for the latest Apple news, rumors, analysis, reviews, how-tos and deals.)
Cult of Mac
Today in Apple history: iTunes sales hit astonishing new heights
Shown as published in the source's RSS feed. IndiaAIFounders doesn't link out to third-party sites — this is the complete detail available from the feed itself.