ReplyManager was created to allow multiple users within a company or team to login and view role-based emails within the same folder. These team members may be answering emails at the same time. To avoid duplicate work, we've added a feature to warn users when someone else is viewing that email.
The warning "This message thread is currently being viewed by another user" is displayed at the top of the email thread. It DOES NOT prevent users from performing any functions on the email.