ICQ is currently owned by the Mail.ru Group, and the platform is still active with countless millions of users. Mail.ru is one of the leading Russian internet providers, and with Windows Phone's positive reception in Russia and Russian speaking countries, ICQ is definitely not a dead platform.
As well as ICQ, the client also talks to Facebook IM, Odnoklassniki, Mail.ru's IM platform, and your GTalk contacts.
Addressed in the update to v 1.8.6 are:
- Faster launch
- Chat page improvements
- Better push notifications
- Picture sharing from gallery
- Video recording and sharing
- Free SMS improvements
The client is a free download, and you can find it in the AAWP App Directory.