That surpasses first-day sales of the Xbox 360, the previous-generation model that went on sale eight years ago.
The new console was launched in 13 markets and the software giant said it sold had out at most retailers.
Microsoft added that in the first day of game play, fans killed more than 60 million zombies in Dead Rising 3 and drove more than 3.6 million miles on Forza Motorsport 5.
Sony said last week that more than a million PlayStation 4 consoles were sold in the 24 hours since its release.
COMMENT RULES: Comments that are judged to be defamatory, abusive or in bad taste are not acceptable and contributors who consistently fall below certain criteria will be permanently blacklisted. The moderator will not enter into debate with individual contributors and the moderator’s decision is final. It is Belfast Telegraph policy to close comments on court cases, tribunals and active legal investigations. We may also close comments on articles which are being targeted for abuse. Problems with commenting? email@example.com