Team collaboration chat apps
Try "SLACK" App, we have used it, its quite user friendly.
We have been using Microsoft Teams as part of our Office 365 deployment. It is quite useful.
Recently they released a free version of Microsoft Teams. You could start with that.
In addition to these tools, Yammer and Stride are 2 other apps that are known for their effectiveness.
The choice of the right app depends on your team's collaboration style too. Sai Baba Andavolu What are your primary needs for the chat app?
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