Yahoo Messenger one of the most popular chat clients in the Philippines, will experience some major change. The legacy client (the one usually installed on almost all computer shops) will stop working by August 5, 2016. The web version (LINK), the Android (LINK) / iOS (LINK) and Yahoo Mail version (LINK) will still continue to work.
I remember YM fondly during the computer shop managing days, as a source of pain (config issues, web cam issues, source of viruses) and happiness (common way of chatting with loved ones). I guess its Yahoo's way of forcing users to adapt the web and mobile OS versions, to boost popularity. Especially now that the competition is fierce (Hangouts, FB Messenger, Viber, etc).