Wunderlist joins MicrosoftMicrosoft confirmed its acquisition of Wunderlist developer 6Wunderkinder in a blog post published today. The app will help strengthen Microsoft’s cross-platform mobile options.

“Seeing Wunderlist grow to what it is today – 13+ million users, who have collectively created more than 1 billion to-dos – blows my mind,” Wunderlist founder and CEO Christian Reber said in a post on his company’s site.

Details of the acquisition were first reported yesterday. The Berlin-based company will add to Microsoft’s stable of cross-platform productivity apps, joining other recent acquisitions Sunrise and Acompli. All three apps have been praised for their clean design and it-just-works functionality, creating simple solutions without the frills of some traditional Microsoft software.

“Customers can expect [Wunderlist] to remain free in all of its existing markets,” Microsoft said in the blog post. “There will be no price changes for Wunderlist Pro or Wunderlist for Business customers and the service will continue to support a wide range of third-party apps and integrated services.

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