When the Xbox One launched, one major point of contention for gamers was the lack of backwards compatability with Xbox 360 games. That's all about to change, though, as Microsoft today announced that Xbox 360 games will soon work on Xbox One.

During a press conference at E3, Redmond said that 100 Xbox 360 titles will be playable on Xbox One this fall. Select titles, however, will be available today for Xbox preview members, while everyone else will get a taste in time for the holidays.

A demo featured some Mass Effect gameplay, but an image tweeted by the Xbox team (above) also tipped Halo: Reach, Borderlands, Perfect Dark Zero, and more.

When they are available, Xbox 360 games can be downloaded to your Xbox One dashboard; Xbox One will also support Xbox 360 discs.

The move was one of the most requested features for Xbox One, Microsoft's Phil Spencer said today. It comes as the company is still doing battle with Sony for console dominance. Xbox One briefly took the top spot in the U.S. in March, but Sony regained that position last month.

Microsoft's two-hour presser, meanwhile, featured plenty of gameplay trailers for upcoming titles. There was also a demo of Minecraft just for Microsoft's HoloLens.

Redmond is not limiting itself to HoloLens when it comes to virtual and augmented worlds, though. Today, it said it will work with Valve and its Vive VR headset to ensure that Windows 10 is the "best platform for gaming." That comes after Microsoft was on stage at the Oculus VR presser last week to discuss Oculus Rift's Windows 10 compatibility.