Frank Thelen responded and together Reber and Thelen developed first concepts for Wunderlist. In 2009, Wunderlist's CEO Christian Reber called on the social network platform XING for business partners to create a new to-do app. After this date, the application would no longer sync but users could still import their content into Microsoft To Do. On December 6, 2019, Microsoft announced that it would shut down Wunderlist on May 6, 2020.

In April 2017, Microsoft announced that Wunderlist would eventually be discontinued in favor of Microsoft To Do, a new multi-platform app developed by the Wunderlist team that has direct integration with the company's Office 365 service. The company was acquired by Microsoft in June 2015, at which time the app had over 13 million users.

Wunderlist was created in 2011 by Berlin-based startup 6Wunderkinder (Engl.: 6Prodigies). Wunderlist was free additional collaboration features were available in a paid version known as Wunderlist Pro, released April 2013. It allowed users to create lists to manage their tasks from a smartphone, tablet, computer and smartwatch. Wunderlist is a discontinued cloud-based task management application.

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