Yahoo! has acquired Astrid, the corporate behind the to-do list app which was downloaded by over 4m people because it first launched in 2008.

Astrid‘ enables users to create crossplatform lists and reminders, whether by typing or speaking, and share them with contacts. It also offers email management functionality.

For existing users, Astrid will continue to operate as normal for the following 90 days, before presumably being shuttered to make way for Yahoo!’s implementation of the technology. Users would be given the choice to download their data from the service, and subscribers shall be given refunds by Yahoo!

“We sought to assist as nearly all people as possible become happier, healthier and more productive,” said Astrid co-founder Jon Paris. “We’re really excited to affix the mobile team and continue this work with Yahoo!’s goal of ‘making the world’s daily habits more inspiring and entertaining’.”

It’s currently unknown how much Yahoo! paid for Astrid, and the way it compares to the hot acquisition of mobile news startup Summly, which reportedly cost around $30m (£19m). One thing’s for certain though – Yahoo! is decided to make a comeback, with a renewed emphasis on mobile, and it’s happy spending hundreds of cash within the process.