diff --git a/addons/im_livechat/static/src/legacy/models/abstract_thread.js b/addons/im_livechat/static/src/legacy/models/abstract_thread.js
index 55495e12594..db073706057 100644
--- a/addons/im_livechat/static/src/legacy/models/abstract_thread.js
+++ b/addons/im_livechat/static/src/legacy/models/abstract_thread.js
@@ -103,16 +103,6 @@ var AbstractThread = Class.extend(Mixins.EventDispatcherMixin, {
     hasMessages: function () {
         return !_.isEmpty(this.getMessages());
     },
-    /**
-     * States whether this thread is compatible with the 'seen' feature.
-     * By default, threads do not have thsi feature active.
-     * @see {im_livechat.legacy.mail.model.ThreadSeenMixin} to enable this feature on a thread.
-     *
-     * @returns {boolean}
-     */
-    hasSeenFeature: function () {
-        return false;
-    },
     /**
      * States whether this thread is folded or not.
      *
diff --git a/addons/im_livechat/static/src/legacy/public_livechat.scss b/addons/im_livechat/static/src/legacy/public_livechat.scss
index 53888a85b01..5f7bcea31da 100644
--- a/addons/im_livechat/static/src/legacy/public_livechat.scss
+++ b/addons/im_livechat/static/src/legacy/public_livechat.scss
@@ -322,10 +322,6 @@ $o-mail-thread-window-zindex: $zindex-modal + 1 !default;
             .o_thread_message_side_date {
                 opacity: 0;
             }
-
-            .o_mail_thread_message_seen_icon:not(.o_all_seen) {
-                opacity: $o-mail-thread-icon-opacity*0.5;
-            }
         }
         .o_thread_icon {
             cursor: pointer;
@@ -348,11 +344,6 @@ $o-mail-thread-window-zindex: $zindex-modal + 1 !default;
                     opacity: 1;
                 }
             }
-            .o_thread_message_sidebar {
-                .o_mail_thread_message_seen_icon {
-                    display: none;
-                }
-            }
         }
 
         .o_mail_redirect {
@@ -510,34 +501,6 @@ $o-mail-thread-window-zindex: $zindex-modal + 1 !default;
     }
 }
 
-// ------------------------------------------------------------------
-// Thread seen icon: shared between discuss and chat windows
-// ------------------------------------------------------------------
-
-.o_mail_thread_message_seen_icon {
-    position: relative;
-    opacity: 0.6;
-
-    &.o_all_seen {
-        color: $o-enterprise-color;
-    }
-
-    &:hover {
-        cursor: pointer;
-        opacity: 0.8;
-    }
-
-    .fa-check:nth-child(1) {
-        padding-left: 3px;
-    }
-
-    .fa-check:nth-child(2) {
-        position: absolute;
-        top: -1px;
-        left: 0px;
-    }
-}
-
 //-------------------------------------
 // legacy: im_livechat/im_livechat.scss
 //-------------------------------------
diff --git a/addons/im_livechat/static/src/legacy/public_livechat.xml b/addons/im_livechat/static/src/legacy/public_livechat.xml
index 1250bcf4e5a..2063e341c12 100644
--- a/addons/im_livechat/static/src/legacy/public_livechat.xml
+++ b/addons/im_livechat/static/src/legacy/public_livechat.xml
@@ -354,7 +354,6 @@
                 <i t-if="!displayAuthorMessages[message.getID()] and options.displayStars and message.getType() !== 'notification'"
                     t-att-class="'fa o_thread_message_star o_thread_icon ' + (message.isStarred() ? 'fa-star' : 'fa-star-o')"
                     t-att-data-message-id="message.getID()" title="Mark as Todo" role="img" aria-label="Mark as todo"/>
-                <t t-if="!displayAuthorMessages[message.getID()] and thread.hasSeenFeature()" t-call="im_livechat.legacy.mail.widget.Thread.Message.SeenIcon"/>
             </div>
             <div class="o_thread_message_core">
                 <p t-if="displayAuthorMessages[message.getID()]" class="o_mail_info text-muted">
@@ -390,7 +389,6 @@
                         </span>
                     </span>
                     <span t-attf-class="o_thread_icons">
-                        <t t-if="thread.hasSeenFeature()" t-call="im_livechat.legacy.mail.widget.Thread.Message.SeenIcon"/>
                        <i t-if="message.isLinkedToDocumentThread() and options.displayReplyIcons"
                            class="fa fa-reply o_thread_icon o_thread_message_reply"
                            t-att-data-message-id="message.getID()" title="Reply" role="img" aria-label="Reply"/>
@@ -431,70 +429,6 @@
         </t>
     </t>
 
-    <!--
-        Display the seen icon of a message in the thread.
-        It shows the fetch 'check' before the seen 'check'. We change the order in the template
-        so that fetch 'check' is on top of 'seen' check (z-index does not work with absolute positioning)
-
-        @param {mail.model.Thread} thread
-        @param {mail.model.Message} message
-    -->
-    <t t-name="im_livechat.legacy.mail.widget.Thread.Message.SeenIcon">
-        <t t-if="message.isMyselfAuthor() and message.getID() >= thread.getLastMessageIDSeenByEveryone()">
-            <span t-attf-class="o_mail_thread_message_seen_icon #{thread.hasEveryoneSeen(message) ? 'o_all_seen' : ''}" t-att-data-message-id="message.getID()">
-                <t t-if="thread.hasSomeoneFetched(message)">
-                    <i class="fa fa-check"/>
-                </t>
-                <t t-if="thread.hasSomeoneSeen(message)">
-                    <i class="fa fa-check"/>
-                </t>
-            </span>
-        </t>
-    </t>
-
-    <!--
-        Display the popover content when clicking the seen icion of a message in the thread.
-
-        List the members that have received the messages, and the members that have seen it.
-
-        @param {mail.model.Thread} thread
-        @param {mail.model.Message} message
-    -->
-    <t t-name="im_livechat.legacy.mail.widget.Thread.Message.SeenIconPopoverContent">
-        <div class="o_mail_thread_message_seen_icon_content">
-            <t t-if="thread.hasEveryoneSeen(message)">
-                <p>Seen by Everyone</p>
-            </t>
-            <t t-else="">
-                <t t-if="thread.hasSomeoneSeen(message)">
-                    <t t-set="seen_members" t-value="thread.getSeenMembers(message)"/>
-                    Seen by:
-                    <ul>
-                        <li t-foreach="seen_members" t-as="member">
-                            <t t-esc="member.name"/> (<t t-esc="member.email"/>)
-                        </li>
-                    </ul>
-                </t>
-                <t t-if="thread.hasSomeoneFetched(message)">
-                    <t t-if="thread.hasEveryoneFetched(message)">
-                        <p>Received by Everyone</p>
-                    </t>
-                    <t t-else="">
-                        <t t-set="fetched_members" t-value="thread.getFetchedNotSeenMembers(message)"/>
-                        <t t-if="!_.isEmpty(fetched_members)">
-                            Received by:
-                            <ul>
-                                <li t-foreach="fetched_members" t-as="member">
-                                    <t t-esc="member.name"/> (<t t-esc="member.email"/>)
-                                </li>
-                            </ul>
-                        </t>
-                    </t>
-                </t>
-            </t>
-        </div>
-    </t>
-
     <!--
         @param {Object[]} notifications: list of notifications
            A notification is an object with at least the following keys:
diff --git a/addons/im_livechat/static/src/legacy/widgets/thread.js b/addons/im_livechat/static/src/legacy/widgets/thread.js
index da96e6ebe32..bbef1450413 100644
--- a/addons/im_livechat/static/src/legacy/widgets/thread.js
+++ b/addons/im_livechat/static/src/legacy/widgets/thread.js
@@ -86,9 +86,6 @@ var ThreadWidget = Widget.extend({
         this._selectedMessageID = null;
         this._currentThreadID = null;
         this._messageMailPopover = null;
-        this._messageSeenPopover = null;
-        // used to track popover IDs to destroy on re-rendering of popovers
-        this._openedSeenPopoverIDs = [];
     },
     /**
      * The message mail popover may still be shown at this moment. If we do not
@@ -101,10 +98,6 @@ var ThreadWidget = Widget.extend({
         if (this._messageMailPopover) {
             this._messageMailPopover.popover('hide');
         }
-        if (this._messageSeenPopover) {
-            this._messageSeenPopover.popover('hide');
-        }
-        this._destroyOpenSeenPopoverIDs();
         this._super();
     },
     /**
@@ -214,9 +207,6 @@ var ThreadWidget = Widget.extend({
         }
 
         this._renderMessageNotificationPopover(messages);
-        if (thread.hasSeenFeature()) {
-            this._renderMessageSeenPopover(thread, messages);
-        }
     },
 
     /**
@@ -334,15 +324,6 @@ var ThreadWidget = Widget.extend({
     // Private
     //--------------------------------------------------------------------------
 
-    /**
-     * @private
-     */
-    _destroyOpenSeenPopoverIDs: function () {
-        _.each(this._openedSeenPopoverIDs, function (popoverID) {
-            $('#' + popoverID).remove();
-        });
-        this._openedSeenPopoverIDs = [];
-    },
     /**
      * Modifies $element to add the 'read more/read less' functionality
      * All element nodes with 'data-o-mail-quote' attribute are concerned.
@@ -485,46 +466,6 @@ var ThreadWidget = Widget.extend({
             },
         });
     },
-    /**
-     * Render the popover when mouse hovering on the seen icon of a message
-     * in the thread. Only seen icons in non-squashed message have popover,
-     * because squashed messages hides this icon on message mouseover.
-     *
-     * @private
-     * @param {im_livechat.legacy.mail.model.AbstractThread} thread with thread seen mixin,
-     *   @see {im_livechat.legacy.mail.model.ThreadSeenMixin}
-     * @param {im_livechat.legacy.mail.model.Message[]} messages list of messages in the
-     *   rendered thread.
-     */
-    _renderMessageSeenPopover: function (thread, messages) {
-        var self = this;
-        this._destroyOpenSeenPopoverIDs();
-        if (this._messageSeenPopover) {
-            this._messageSeenPopover.popover('hide');
-        }
-        if (!this.$('.o_thread_message_core .o_mail_thread_message_seen_icon').length) {
-            return;
-        }
-        this._messageSeenPopover = this.$('.o_thread_message_core .o_mail_thread_message_seen_icon').popover({
-            html: true,
-            boundary: 'viewport',
-            placement: 'auto',
-            trigger: 'hover',
-            offset: '0, 1',
-            content: function () {
-                var $this = $(this);
-                self._openedSeenPopoverIDs.push($this.attr('aria-describedby'));
-                var messageID = $this.data('message-id');
-                var message = _.find(messages, function (message) {
-                    return message.getID() === messageID;
-                });
-                return QWeb.render('im_livechat.legacy.mail.widget.Thread.Message.SeenIconPopoverContent', {
-                    thread: thread,
-                    message: message,
-                });
-            },
-        });
-    },
     /**
      * @private
      */