Xbox One outsold PlayStation 4 during the month of July. The news comes from NPD Group (via GameSpot), who has gathered sales data from last month and broken down the numbers. NPD won't release an official report until sometime next week, but both it and Microsoft have verified the news.
At first glance, this news might seem to fall under the news-that-really-isn't category of news coverage. The significance lies in the fact that Sony has routinely sold more PS4s than Microsoft has sold Xbox One consoles since the machines launched in November 2013. Sony has more notches in its belt than Microsoft, which hasn't claimed the number-one spot since October 2015.
Microsoft decided to stop sharing Xbox One sales numbers all the way back in November 2014, just one year after the console's launch. Instead, the company has been focusing on every statistics except news, namely hours played and active users on Xbox Live.
For all we know, Microsoft might not include sales data in next week's report. I'd venture to guess the company had to give NPD Group a peek at the very least, though, in order for the announcement to go through.
This news is also surprising given that the sales data pertains to the original Xbox One, rather than the recently launched Xbox One S, which did not go on sale until earlier this month. Logic dictates that an updated console model would cut into sales of older hardware, but that does not seem to be the case.
Microsoft plans to release more Xbox One S consoles later this month. The model with the 2TB hard drive has sold out, and there are no plans to replenish stock. If you waited to pull the trigger on an S, you'll have to go for one of the bundles that includes a game.
Furthermore, models set to deploy later this month come with hard drives in the range of 500GB and 1TB; only special editions such as the Gears of War 4 model scheduled to launch in October come with 2TB hard drives.