AOL announced Friday that it would be discontinuing its beloved messaging program AOL Instant Messenger (affectionately referred to as AIM). After a 20 year run, the company said AIM “will be shut down and will no longer work” as of December 15, 2017.

“We know there are so many loyal fans who have used AIM for decades; and we loved working and building the first chat app of its kind since 1997,” the company said on its Help site. “Our focus will always be on providing the kind of innovative experiences consumers want.”

A host of users — many in the millennial demographic — took to Twitter to mourn the iconic social media platform:

AOL said it had no plans to replace its signature chat program, one of the first of its kind. Michael Albers, the Vice President of Communications Product at Oath (the Verizon-owned parent company of AOL and Yahoo!) wrote on Tumblr that the decision was made at least in part because of shifts in the way people now communicate but said the company was looking forward to creating “more products and experiences that people around the world love.”

“AIM tapped into new digital technologies and ignited a cultural shift, but the way in which we communicate with each other has profoundly changed,” he said. “We are more excited than ever to continue building the next generation of iconic brands and life-changing products for users around the world.”

AOL AIM AOL announced it would be discontinuing its icon AIM messaging platform. In this photo, the AOL icon stands on a computer screen. Photo: Photo by David Silverman/Getty Images