After 20 years since its 1998 release as Yahoo Pager, today's Yahoo Messenger — a Verizon property starting in 2017 — will be shut down in about five weeks. Although there is no official replacement for this iconic product, its successor might be Squirrel, a messaging app which is currently being tested by a few chosen ones.
https://www.notebookcheck.net/Yahoo-Messenger-going-down-for-good-on-July-17-after-a-two-decade-run.308408.0.html