brotherton-erpnext/erpnext/docs/user/guides/collaboration-tools/messages.md

You can send and receive messages from the system by using the Messages tool.
If you send a message to a user, and the user is logged in, it will appear as
a popup message and the unread messages counter in the top toolbar will be
updated.

![Message List]({{url_prefix}}/assets/old_images/erpnext/message-list.png)

You can choose to send message to all the users, or to specific user.

![Messsage To]({{url_prefix}}/assets/old_images/erpnext/message-to.png)

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