GroupMe is a free, cross-platform instant messaging app that is designed primarily for group messaging. It works like a private chat room for your small group and can be used for family, work or other group communications.
WinBeta reports that Microsoft has released a brand new version of the app for its new Windows 10 Mobile platform. According to the app description, the new app has been rebuilt “from the ground up for Windows 10,” and that the developers are working to add more features to the app soon.
Microsoft is pushing it as an alternative to Rooms which was shut down recently.