diff --git a/install.sh b/install.sh
new file mode 100644
index 0000000..245075a
--- /dev/null
+++ b/install.sh
@@ -0,0 +1,85 @@
+#!/bin/bash
+
+#=================================================================================
+# M365 Mailbox Backup Tool - Automatic Installation Script (v2.0 - Final English)
+#=================================================================================
+
+# --- Color Codes ---
+GREEN='\033[0;32m'
+RED='\033[0;31m'
+NC='\033[0m'
+
+if [ "$EUID" -ne 0 ]; then
+  echo -e "${RED}Please run this script with 'sudo': sudo ./install.sh${NC}"
+  exit 1
+fi
+
+echo "=== M365 Backup Tool Installation Started ==="
+
+# --- User Input Block ---
+IP_ADDR=$(hostname -I | awk '{print $1}')
+REDIRECT_URI="https://$IP_ADDR/get_token"
+echo "---------------------------------------------------------------------"
+echo "IMPORTANT: Please go to your Azure AD App Registration and add the following"
+echo "Redirect URI under the 'Web' platform section:"
+echo ""
+echo "$REDIRECT_URI"
+echo ""
+echo "---------------------------------------------------------------------"
+read -p "Press Enter after you have added the Redirect URI in the Azure Portal..."
+
+echo -n "Enter your Azure Tenant ID: "
+read TENANT_ID
+echo -n "Enter your Application (Client) ID: "
+read CLIENT_ID
+echo -n "Enter your Client Secret Value (will not be visible): "
+read -s CLIENT_SECRET
+echo ""
+echo -n "Enter comma-separated emails of allowed admins (e.g., admin1@company.com): "
+read ALLOWED_ADMINS
+echo ""
+echo "Credentials received."
+
+# --- System Dependency Installation ---
+echo "--> Updating system and installing required packages (nginx, redis, python3-venv)..."
+apt-get update > /dev/null 2>&1
+apt-get install -y nginx redis-server python3-pip python3-venv > /dev/null 2>&1
+
+# --- Project Directory and Virtual Environment ---
+PROJECT_DIR="/opt/m365-backup-tool"
+USERNAME=${SUDO_USER:-$(whoami)}
+
+echo "--> Creating project directory: $PROJECT_DIR"
+mkdir -p "$PROJECT_DIR"
+cd "$PROJECT_DIR"
+
+echo "--> Creating Python virtual environment..."
+python3 -m venv venv
+
+echo "--> Installing Python libraries..."
+source venv/bin/activate
+pip install Flask gunicorn "celery[redis]" msal requests python-decouple > /dev/null 2>&1
+deactivate
+
+# --- Application File Creation ---
+
+# .env file
+echo "--> Creating .env file for credentials..."
+cat <<EOF > .env
+TENANT_ID=${TENANT_ID}
+CLIENT_ID=${CLIENT_ID}
+CLIENT_SECRET=${CLIENT_SECRET}
+FLASK_SECRET_KEY=$(python3 -c 'import secrets; print(secrets.token_hex(24))')
+ALLOWED_ADMINS=${ALLOWED_ADMINS}
+REDIRECT_URI=${REDIRECT_URI}
+EOF
+
+# app.py file
+echo "--> Creating main application file (app.py)..."
+cat <<'EOF' > app.py
+import os, re, msal, requests, json, secrets
+from flask import Flask, request, redirect, url_for, render_template, send_from_directory, session
+from celery import Celery
+from email import policy
+from email.parser import BytesParser
+from datetime