Starting Thursday, April 10, Microsoft began gradually rolling out a preview of Recall, which records a user's activity by taking continuous screenshots of their computer screen (via The Verge ). Those screenshots then become searchable, letting users recall past activity.

Microsoft has made sure that the feature is turned off by default. You have to choose to switch it on, and you can also pause or stop it anytime.

Microsoft described Recall in a recent blog post: "You work across so many apps, sites, and documents it can be hard to remember where you saw something you want to get back to. Recall saves you time by offering an entirely new way to search for things you’ve seen or done on your PC securely."