diff --git a/package/Invoke-MailboxMessageReport.ps1 b/package/Invoke-MailboxMessageReport.ps1
index aa1d0ca..08b2320 100644
--- a/package/Invoke-MailboxMessageReport.ps1
+++ b/package/Invoke-MailboxMessageReport.ps1
@@ -104,7 +104,18 @@
     Exit codes : 0 = completed, 1 = failed, 2 = finished with warnings (a mailbox or a folder not read...).
     Documentation : docs\MailboxMessageReport-UserGuide.html (user guide: prerequisites, everyday commands) and
                     docs\MailboxMessageReport-Guide.html (developer guide); sources: docs\*.md
+
+    Disclaimer:
+    This Script is a Personal project.
+    It's provided "AS-IS". It's not an official Microsoft product so no support can be expected from Microsoft.
+
+    As any scripts you must read carefully the documentation and test it first in a Test environment before any run in Production.
+
+    The archive is read through an ID that Microsoft Graph gives (a beta endpoint) and opens, but that its
+    documentation does not describe for the archive: test it in your environment before production use.
+    The reports contain personal data (addresses, subjects): store and share them accordingly.
 #>
+
 #Requires -Version 7.4
 [CmdletBinding()]
 param(
diff --git a/package/README.md b/package/README.md
index 06ea58f..46d00b4 100644
--- a/package/README.md
+++ b/package/README.md
@@ -52,3 +52,12 @@ notepad .\config\MailboxMessageReport.config.psd1          # tenant, application
 Project page, releases and change log: https://github.com/Nico77600/MailboxMessageReport
 
 License: [MIT](LICENSE).
+
+## Disclaimer
+
+This Script is a Personal project.
+It's provided "AS-IS". It's not an official Microsoft product so no support can be expected from Microsoft.
+
+As any scripts you must read carefully the documentation and test it first in a Test environment before any run in Production.
+
+The archive is read through an ID that Microsoft Graph gives (a beta endpoint) and opens, but that its documentation does not describe for the archive: test it in your environment before production use. The reports contain personal data (addresses, subjects): store and share them accordingly.
diff --git a/tests/MailboxMessageReport.Tests.ps1 b/tests/MailboxMessageReport.Tests.ps1
index c6fa5e9..a8f6e09 100644
--- a/tests/MailboxMessageReport.Tests.ps1
+++ b/tests/MailboxMessageReport.Tests.ps1
@@ -100,6 +100,42 @@ BeforeAll {
     }
 }
 
+Describe 'Runtime disclaimer' {
+    BeforeAll {
+        $script:DisclaimerRepo = Split-Path $PSScriptRoot -Parent
+        $script:DisclaimerConfig = Get-Content (Join-Path $script:DisclaimerRepo '.github\ci.json') -Raw | ConvertFrom-Json
+        $script:DisclaimerRuntime = Join-Path $script:DisclaimerRepo $script:DisclaimerConfig.runtimeRoot
+        $script:DisclaimerPattern = '(?ms)^## Disclaimer[ \t]*\r?\n(?<Body>.*?)(?=^##[ \t]|\z)'
+        $rootReadme = [IO.File]::ReadAllText((Join-Path $script:DisclaimerRepo 'README.md'))
+        $matches = [regex]::Matches($rootReadme, $script:DisclaimerPattern)
+        if ($matches.Count -ne 1) { throw 'The root README must contain exactly one canonical disclaimer.' }
+        $script:CanonicalDisclaimer = $matches[0].Groups['Body'].Value.Trim().Replace("`r`n", "`n")
+        function ConvertTo-DisclaimerParagraphs([string]$Text) {
+            (($Text.Trim() -split '\r?\n[ \t]*\r?\n') | ForEach-Object { ($_ -replace '\s+', ' ').Trim() }) -join "`n`n"
+        }
+    }
+
+    It 'keeps the runtime README disclaimer identical to the canonical root section' {
+        $readme = [IO.File]::ReadAllText((Join-Path $script:DisclaimerRuntime 'README.md'))
+        $matches = [regex]::Matches($readme, $script:DisclaimerPattern)
+        $matches.Count | Should -Be 1
+        $matches[0].Groups['Body'].Value.Trim().Replace("`r`n", "`n") | Should -BeExactly $script:CanonicalDisclaimer
+    }
+
+    It 'keeps the public entry script disclaimer attached to its help with the same wording and paragraphs' {
+        $path = Join-Path $script:DisclaimerRuntime $script:DisclaimerConfig.packageEntry
+        $errors = $null
+        $ast = [Management.Automation.Language.Parser]::ParseFile($path, [ref]$null, [ref]$errors)
+        @($errors).Count | Should -Be 0
+        $help = $ast.GetHelpContent()
+        $help | Should -Not -BeNullOrEmpty
+        $notes = $help.Notes
+        [regex]::Matches($notes, '(?m)^[ \t]*Disclaimer:[ \t]*$').Count | Should -Be 1
+        $body = [regex]::Match($notes, '(?s)(?:^|\r?\n)[ \t]*Disclaimer:[ \t]*\r?\n(?<Body>.*)\z').Groups['Body'].Value
+        (ConvertTo-DisclaimerParagraphs $body) | Should -BeExactly (ConvertTo-DisclaimerParagraphs $script:CanonicalDisclaimer)
+    }
+}
+
 Describe 'Configuration and request' {
     It 'reads the delivered configuration and resolves the paths from the tool folder' {
         $c = Import-MmrConfiguration