diff --git a/README.md b/README.md
index f113289d4..03a30208e 100644
--- a/README.md
+++ b/README.md
@@ -64,7 +64,7 @@ En local, un utilisateur de test est créé automatiquement, avec les identifian
     AutoArchiveProcedureJob.set(cron: "* * * * *").perform_later
     WeeklyOverviewJob.set(cron: "0 7 * * 1").perform_later
     AutoReceiveDossiersForProcedureJob.set(cron: "* * * * *").perform_later(procedure_declaratoire_id, Dossier.states.fetch(:en_instruction))
-    SendinblueUpdateAdministrateursJob.set(cron: "0 10 * * *").perform_later
+    UpdateAdministrateurUsageStatisticsJob.set(cron: "0 10 * * *").perform_later
     FindDubiousProceduresJob.set(cron: "0 0 * * *").perform_later
     Administrateurs::ActivateBeforeExpirationJob.set(cron: "0 8 * * *").perform_later
     WarnExpiringDossiersJob.set(cron: "0 0 1 * *").perform_later
diff --git a/app/jobs/update_administrateur_usage_statistics_job.rb b/app/jobs/update_administrateur_usage_statistics_job.rb
index 940a98bae..a89fc365f 100644
--- a/app/jobs/update_administrateur_usage_statistics_job.rb
+++ b/app/jobs/update_administrateur_usage_statistics_job.rb
@@ -1,4 +1,6 @@
 class UpdateAdministrateurUsageStatisticsJob < ApplicationJob
+  queue_as :cron
+
   def perform
     AdministrateurUsageStatisticsService.new.update_administrateurs
   end
diff --git a/app/models/dossier.rb b/app/models/dossier.rb
index 3449517ec..18164a03b 100644
--- a/app/models/dossier.rb
+++ b/app/models/dossier.rb
@@ -79,6 +79,7 @@ class Dossier < ApplicationRecord
         piece_justificative_file_attachment: :blob
       ],
       pieces_justificatives: [],
+      avis: [],
       etablissement: [],
       individual: [],
       user: [])
@@ -176,7 +177,7 @@ class Dossier < ApplicationRecord
   end
 
   def messagerie_available?
-    !brouillon? && !archived
+    !brouillon? && !archived && !procedure.archivee?
   end
 
   def retention_end_date
diff --git a/app/serializers/dossier_serializer.rb b/app/serializers/dossier_serializer.rb
index 876b2dcaf..980254ce3 100644
--- a/app/serializers/dossier_serializer.rb
+++ b/app/serializers/dossier_serializer.rb
@@ -23,6 +23,7 @@ class DossierSerializer < ActiveModel::Serializer
   has_many :pieces_justificatives
   has_many :types_de_piece_justificative
   has_one :justificatif_motivation
+  has_many :avis
 
   has_many :champs, serializer: ChampSerializer
 
diff --git a/app/services/administrateur_usage_statistics_service.rb b/app/services/administrateur_usage_statistics_service.rb
index e599d0d3b..5cefeaf68 100644
--- a/app/services/administrateur_usage_statistics_service.rb
+++ b/app/services/administrateur_usage_statistics_service.rb
@@ -24,6 +24,7 @@ class AdministrateurUsageStatisticsService
   def administrateur_stats(administrateur)
     nb_dossiers_by_procedure_id = nb_dossiers_by_procedure_id(administrateur.id)
     nb_dossiers_by_synthetic_state = nb_dossiers_by_synthetic_state(administrateur.id)
+    nb_dossiers_roi = nb_dossiers_by_procedure_id.reject { |procedure_id, _count| is_brouillon(procedure_id) }.map { |_procedure_id, count| count }.sum
 
     result = {
       ds_sign_in_count: administrateur.sign_in_count,
@@ -57,7 +58,9 @@ class AdministrateurUsageStatisticsService
         .map { |_procedure_id, count| count }
         .max || 0,
       nb_dossiers_traite: nb_dossiers_by_synthetic_state['termine'],
-      nb_dossiers_dossier_en_instruction: nb_dossiers_by_synthetic_state['en_instruction']
+      nb_dossiers_dossier_en_instruction: nb_dossiers_by_synthetic_state['en_instruction'],
+      admin_roi_low: nb_dossiers_roi * 7.04,
+      admin_roi_high: nb_dossiers_roi * 17.25
     }
 
     if administrateur.current_sign_in_at.present?
diff --git a/app/services/commentaire_service.rb b/app/services/commentaire_service.rb
index fa3b9a576..b7e8ef206 100644
--- a/app/services/commentaire_service.rb
+++ b/app/services/commentaire_service.rb
@@ -12,6 +12,9 @@ class CommentaireService
     end
 
     def build_with_email(email, dossier, params)
+      if !dossier.messagerie_available?
+        raise ArgumentError, "Commentaires cannot be added to brouillons or archived Dossiers"
+      end
       attributes = params.merge(email: email, dossier: dossier)
       Commentaire.new(attributes)
     end
diff --git a/app/views/shared/dossiers/_messagerie.html.haml b/app/views/shared/dossiers/_messagerie.html.haml
index 5d589fa5b..c50c17eaa 100644
--- a/app/views/shared/dossiers/_messagerie.html.haml
+++ b/app/views/shared/dossiers/_messagerie.html.haml
@@ -4,4 +4,7 @@
       %li.message{ class: commentaire_is_from_me_class(commentaire, connected_user) }
         = render partial: "shared/dossiers/messages/message", locals: { commentaire: commentaire, connected_user: connected_user, messagerie_seen_at: messagerie_seen_at }
 
-  = render partial: "shared/dossiers/messages/form", locals: { commentaire: new_commentaire, form_url: form_url }
+  - if dossier.archived?
+    = render partial: "shared/dossiers/messages/messagerie_disabled", locals: { service: dossier.procedure.service }
+  - else
+    = render partial: "shared/dossiers/messages/form", locals: { commentaire: new_commentaire, form_url: form_url }
diff --git a/app/views/shared/dossiers/messages/_messagerie_disabled.html.haml b/app/views/shared/dossiers/messages/_messagerie_disabled.html.haml
new file mode 100644
index 000000000..5b1564796
--- /dev/null
+++ b/app/views/shared/dossiers/messages/_messagerie_disabled.html.haml
@@ -0,0 +1,14 @@
+.card.feedback
+  .card-title
+    La messagerie est désormais désactivée.
+  %p
+    Pour poser une question sur ce dossier, contactez :
+  %p
+    = service.nom
+    %br
+    = service.organisme
+    %br
+    - horaires = "Horaires : #{formatted_horaires(service.horaires)}"
+    = simple_format(horaires)
+  %p
+    = link_to service.email, "mailto:#{service.email}"
diff --git a/app/views/users/_procedure_footer.html.haml b/app/views/users/_procedure_footer.html.haml
index 495010d95..458c6ed00 100644
--- a/app/views/users/_procedure_footer.html.haml
+++ b/app/views/users/_procedure_footer.html.haml
@@ -27,7 +27,9 @@
             %a{ href: "tel:#{service.telephone}" }= service.telephone
 
           %p
-            Horaires : #{formatted_horaires(service.horaires)}
+            - horaires = "Horaires : #{formatted_horaires(service.horaires)}"
+            = simple_format(horaires)
+
 
         - politiques = politiques_conservation_de_donnees(procedure)
         - if politiques.present?
diff --git a/config/environments/development.rb b/config/environments/development.rb
index 1d51b0cd3..2a5367e65 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -59,7 +59,7 @@ Rails.application.configure do
     port: 3000
   }
 
-  # Use Content-Security-Policy-Report-Only instead of Content-Security-Policy
+  # Use Content-Security-Policy-Report-Only headers
   config.content_security_policy_report_only = true
 
   # Raises error for missing translations
diff --git a/config/environments/production.rb b/config/environments/production.rb
index befbe17aa..0c93feb51 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -109,7 +109,8 @@ Rails.application.configure do
     host: ENV['APP_HOST']
   }
 
-  config.content_security_policy_report_only = true
+  # The Content-Security-Policy is NOT in Report-Only mode
+  config.content_security_policy_report_only = false
 
   config.lograge.enabled = ENV['LOGRAGE_ENABLED'] == 'enabled'
 end
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 2a1fb8e0f..0f05338b6 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -45,7 +45,7 @@ Rails.application.configure do
     protocol: :http
   }
 
-  # Use Content-Security-Policy-Report-Only instead of Content-Security-Policy
+  # Use Content-Security-Policy-Report-Only headers
   config.content_security_policy_report_only = true
 
   config.active_job.queue_adapter = :test
diff --git a/config/initializers/content_security_policy.rb b/config/initializers/content_security_policy.rb
index e7debcc0c..86a32f221 100644
--- a/config/initializers/content_security_policy.rb
+++ b/config/initializers/content_security_policy.rb
@@ -13,8 +13,8 @@ Rails.application.config.content_security_policy do |policy|
   # Pour les CSS, on a beaucoup de style inline et quelques balises <style>
   # c'est trop compliqué pour être rectifié immédiatement (et sans valeur ajoutée:
   # c'est hardcodé dans les vues, donc pas injectable).
-  policy.style_src :self, :unsafe_inline, "*.crisp.chat", "crisp.chat"
-  policy.connect_src "wss://*.crisp.chat"
+  policy.style_src :self, "*.crisp.chat", "crisp.chat", :unsafe_inline
+  policy.connect_src :self, "wss://*.crisp.chat"
   # Pour tout le reste, par défaut on accepte uniquement ce qui vient de chez nous
   # et dans la notification on inclue la source de l'erreur
   policy.default_src :self, :data, :report_sample, "fonts.gstatic.com", "in-automate.sendinblue.com", "player.vimeo.com", "app.franceconnect.gouv.fr", "sentry.io", "static.demarches-simplifiees.fr", "*.crisp.chat", "crisp.chat", "*.sibautomation.com", "sibautomation.com", "data"
diff --git a/spec/controllers/api/v1/dossiers_controller_spec.rb b/spec/controllers/api/v1/dossiers_controller_spec.rb
index 0e8a01186..fee71b685 100644
--- a/spec/controllers/api/v1/dossiers_controller_spec.rb
+++ b/spec/controllers/api/v1/dossiers_controller_spec.rb
@@ -157,7 +157,7 @@ describe API::V1::DossiersController do
         let!(:dossier) { Timecop.freeze(date_creation) { create(:dossier, :with_entreprise, :en_construction, procedure: procedure, motivation: "Motivation") } }
         let(:dossier_id) { dossier.id }
         let(:body) { JSON.parse(retour.body, symbolize_names: true) }
-        let(:field_list) { [:id, :created_at, :updated_at, :archived, :individual, :entreprise, :etablissement, :cerfa, :types_de_piece_justificative, :pieces_justificatives, :champs, :champs_private, :commentaires, :state, :simplified_state, :initiated_at, :processed_at, :received_at, :motivation, :email, :instructeurs, :justificatif_motivation] }
+        let(:field_list) { [:id, :created_at, :updated_at, :archived, :individual, :entreprise, :etablissement, :cerfa, :types_de_piece_justificative, :pieces_justificatives, :champs, :champs_private, :commentaires, :state, :simplified_state, :initiated_at, :processed_at, :received_at, :motivation, :email, :instructeurs, :justificatif_motivation, :avis] }
         subject { body[:dossier] }
 
         it 'return REST code 200', :show_in_doc do
diff --git a/spec/mailers/notification_mailer_spec.rb b/spec/mailers/notification_mailer_spec.rb
index 219cbcae8..b0d203807 100644
--- a/spec/mailers/notification_mailer_spec.rb
+++ b/spec/mailers/notification_mailer_spec.rb
@@ -13,7 +13,7 @@ RSpec.describe NotificationMailer, type: :mailer do
   end
 
   let(:user) { create(:user) }
-  let(:dossier) { create(:dossier, :with_service, user: user) }
+  let(:dossier) { create(:dossier, :with_service, :en_construction, user: user) }
 
   describe '.send_notification' do
     let(:email_template) { instance_double('email_template', subject_for_dossier: 'subject', body_for_dossier: 'body') }
diff --git a/spec/models/dossier_spec.rb b/spec/models/dossier_spec.rb
index a39b96117..7f72f61e6 100644
--- a/spec/models/dossier_spec.rb
+++ b/spec/models/dossier_spec.rb
@@ -736,6 +736,37 @@ describe Dossier do
     end
   end
 
+  describe "#messagerie_available?" do
+    let(:procedure) { create(:procedure) }
+    let(:dossier) { create(:dossier, procedure: procedure) }
+
+    subject { dossier.messagerie_available? }
+
+    context "dossier is brouillon" do
+      before { dossier.state = Dossier.states.fetch(:brouillon) }
+
+      it { is_expected.to be false }
+    end
+
+    context "dossier is archived" do
+      before { dossier.archived = true }
+
+      it { is_expected.to be false }
+    end
+
+    context "procedure is archived" do
+      before { procedure.archived_at = Date.today }
+
+      it { is_expected.to be false }
+    end
+
+    context "procedure is not archived, dossier is not archived" do
+      before { dossier.state = Dossier.states.fetch(:en_instruction) }
+
+      it { is_expected.to be true }
+    end
+  end
+
   context "retention date" do
     let(:procedure) { create(:procedure, duree_conservation_dossiers_dans_ds: 6) }
     let(:uninstructed_dossier) { create(:dossier, :en_construction, procedure: procedure) }
diff --git a/spec/services/administrateur_usage_statistics_service_spec.rb b/spec/services/administrateur_usage_statistics_service_spec.rb
index 657089ed7..a582c1281 100644
--- a/spec/services/administrateur_usage_statistics_service_spec.rb
+++ b/spec/services/administrateur_usage_statistics_service_spec.rb
@@ -29,7 +29,9 @@ describe AdministrateurUsageStatisticsService do
           nb_dossiers: 0,
           nb_dossiers_max: 0,
           nb_dossiers_traite: 0,
-          nb_dossiers_dossier_en_instruction: 0
+          nb_dossiers_dossier_en_instruction: 0,
+          admin_roi_low: 0,
+          admin_roi_high: 0
         )
       end
     end
@@ -80,7 +82,9 @@ describe AdministrateurUsageStatisticsService do
             nb_dossiers: 0,
             nb_dossiers_max: 0,
             nb_dossiers_traite: 0,
-            nb_dossiers_dossier_en_instruction: 0
+            nb_dossiers_dossier_en_instruction: 0,
+            admin_roi_low: 0,
+            admin_roi_high: 0
           )
         end
       end
@@ -108,7 +112,9 @@ describe AdministrateurUsageStatisticsService do
             nb_dossiers: 21,
             nb_dossiers_max: 21,
             nb_dossiers_traite: 7,
-            nb_dossiers_dossier_en_instruction: 7
+            nb_dossiers_dossier_en_instruction: 7,
+            admin_roi_low: 147.84,
+            admin_roi_high: 362.25
           )
         end
       end
@@ -127,7 +133,9 @@ describe AdministrateurUsageStatisticsService do
             nb_dossiers: 0,
             nb_dossiers_max: 0,
             nb_dossiers_traite: 0,
-            nb_dossiers_dossier_en_instruction: 0
+            nb_dossiers_dossier_en_instruction: 0,
+            admin_roi_low: 0,
+            admin_roi_high: 0
           )
         end
       end
@@ -155,7 +163,9 @@ describe AdministrateurUsageStatisticsService do
             nb_dossiers: 0,
             nb_dossiers_max: 0,
             nb_dossiers_traite: 0,
-            nb_dossiers_dossier_en_instruction: 0
+            nb_dossiers_dossier_en_instruction: 0,
+            admin_roi_low: 0,
+            admin_roi_high: 0
           )
         end
       end
@@ -181,7 +191,9 @@ describe AdministrateurUsageStatisticsService do
             nb_dossiers: 3,
             nb_dossiers_max: 3,
             nb_dossiers_traite: 1,
-            nb_dossiers_dossier_en_instruction: 1
+            nb_dossiers_dossier_en_instruction: 1,
+            admin_roi_low: 21.12,
+            admin_roi_high: 51.75
           )
         end
       end
@@ -209,7 +221,9 @@ describe AdministrateurUsageStatisticsService do
             nb_dossiers: 21,
             nb_dossiers_max: 21,
             nb_dossiers_traite: 7,
-            nb_dossiers_dossier_en_instruction: 7
+            nb_dossiers_dossier_en_instruction: 7,
+            admin_roi_low: 147.84,
+            admin_roi_high: 362.25
           )
         end
       end
diff --git a/spec/services/commentaire_service_spec.rb b/spec/services/commentaire_service_spec.rb
index d781ca8ca..1e80c92d3 100644
--- a/spec/services/commentaire_service_spec.rb
+++ b/spec/services/commentaire_service_spec.rb
@@ -2,7 +2,7 @@ require 'spec_helper'
 
 describe CommentaireService do
   describe '.create' do
-    let(:dossier) { create :dossier }
+    let(:dossier) { create :dossier, :en_construction }
     let(:sender) { dossier.user }
     let(:body) { 'Contenu du message.' }
     let(:file) { nil }