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+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Self-Hosted M365 Backup - Documentation</title>
+    <link rel="stylesheet" href="https://unpkg.com/pico.css">
+    <style>
+        body { max-width: 900px; margin: auto; padding: 2rem; }
+        pre { background: #f4f4f4; padding: 1rem; overflow-x: auto; }
+        h1, h2, h3 { margin-top: 2rem; }
+        code { background: #eee; padding: 0.2rem 0.4rem; border-radius: 4px; }
+    </style>
+</head>
+<body>
+    <h1>Self-Hosted M365 Backup</h1>
+    <p>A self-hosted, open-source tool to back up Microsoft 365 mailboxes to standard <code>.eml</code> files. It features a web UI for managing backups, background tasks, search, preview functionality, and secure Microsoft OAuth 2.0 login.</p>
+
+    <h2>Features</h2>
+    <ul>
+        <li><strong>Web-Based Management Panel:</strong> Modern web interface for all operations.</li>
+        <li><strong>Secure Authentication:</strong> Microsoft Identity Platform OAuth 2.0 login with MFA support.</li>
+        <li><strong>Selective Backup:</strong> Choose specific users from the tenant list.</li>
+        <li><strong>Date Filtering:</strong> Back up items by date range.</li>
+        <li><strong>Background Tasks:</strong> Large jobs run asynchronously via Celery + Redis.</li>
+        <li><strong>Task Status Dashboard:</strong> Monitor task progress and results.</li>
+        <li><strong>Interactive Restore Portal:</strong>
+            <ul>
+                <li>Navigation through mailbox folders</li>
+                <li>List of emails in selected folder</li>
+                <li>In-browser email preview without downloading</li>
+            </ul>
+        </li>
+        <li><strong>Privacy-by-Design:</strong> Email previews blurred by default, hover-to-reveal for admins.</li>
+        <li><strong>Full-Text Search:</strong> Search subject and body of emails.</li>
+        <li><strong>Automated Installation:</strong> Single <code>install.sh</code> script deploys the app on Ubuntu.</li>
+    </ul>
+
+    <h2>Architecture</h2>
+    <ul>
+        <li><strong>Backend:</strong> Python, Flask</li>
+        <li><strong>Web Server:</strong> Gunicorn + Nginx (Reverse Proxy)</li>
+        <li><strong>Background Tasks:</strong> Celery</li>
+        <li><strong>Queue/Broker:</strong> Redis</li>
+        <li><strong>Frontend:</strong> HTML, Pico.css, HTMX</li>
+        <li><strong>Authentication:</strong> Microsoft Identity Platform (OAuth 2.0)</li>
+    </ul>
+
+    <h2>Installation Guide</h2>
+
+    <h3>I. Azure Portal Configuration</h3>
+    <ol>
+        <li><strong>App Registration:</strong>
+            <ul>
+                <li>Go to <code>portal.azure.com</code> → Azure Active Directory → App registrations → + New registration</li>
+                <li>Name the app (e.g., <code>M365-Backup-Tool</code>) and click Register</li>
+            </ul>
+        </li>
+        <li><strong>API Permissions:</strong>
+            <ul>
+                <li>Microsoft Graph → Add Permissions</li>
+                <li>Application Permissions: <code>User.Read.All</code>, <code>Mail.Read.All</code></li>
+                <li>Delegated Permissions: <code>User.Read</code></li>
+                <li>Click "Grant admin consent"</li>
+            </ul>
+        </li>
+        <li><strong>Redirect URI:</strong>
+            <ul>
+                <li>Authentication → + Add platform → Web</li>
+                <li>Enter: <code>https://&lt;your_server_ip&gt;/get_token</code></li>
+            </ul>
+        </li>
+        <li><strong>Client Secret:</strong>
+            <ul>
+                <li>Certificates & secrets → + New client secret</li>
+                <li>Copy the secret value immediately</li>
+            </ul>
+        </li>
+    </ol>
+    <p>Required info: <code>Tenant ID</code>, <code>Client ID</code>, <code>Client Secret Value</code></p>
+
+    <h3>II. Server Installation</h3>
+    <ol>
+        <li>Requirements: Fresh Ubuntu 22.04 LTS server</li>
+        <li>Copy <code>install.sh</code> to the server</li>
+        <li>Make it executable: <pre>chmod +x install.sh</pre></li>
+        <li>Run the script: <pre>sudo ./install.sh</pre></li>
+        <li>Provide Azure credentials and list of admin emails</li>
+        <li>Wait for installation to complete; script outputs server access IP</li>
+    </ol>
+
+    <h2>Usage</h2>
+    <ul>
+        <li>Open browser: <code>https://&lt;your_server_ip&gt;</code></li>
+        <li>Accept security warning (self-signed cert)</li>
+        <li>Login with authorized Microsoft account</li>
+        <li><strong>New Backup:</strong> Start a new backup task</li>
+        <li><strong>Existing Backups:</strong> Browse, search, preview backups</li>
+        <li><strong>Tasks:</strong> Monitor background tasks and status</li>
+    </ul>
+
+    <h2>License</h2>
+    <p>Open-source, MIT License.</p>
+
+</body>
+</html>
