In a recent leak from WP7Forum.ru it was revealed that a RCS-e app will be coming to Windows Phone 7.8.
We now have confirmation of this leak, with Deutsche Telekom AKA T-Mobile revealing the same information during a IFA Preview Event in Munich today.
Talking about their new Joyn RCS-e service, which will provide chat, file transfer and video chat functionality, and will be interoperable with Vodafone, Telefonica, Orange and Telecom Italia due its standards-based nature, they confirmed that it will be built into Windows Phone 8 (already revealed by Microsoft) and will be coming as an app to older Windows Phones.
The Joyn service will offer free chat and file transfer for users with a data plan, but will charge for video chat.
RCS-e is an attempt by carriers to take the initiative back from â€œover the topâ€ services like Whatsapp and Skype by providing as reliable interoperability like SMS. The initiative is however pretty late and success is far from guaranteed.