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To utilize Electron for loading an external site and store messages in JSON format, you can follow these steps:

1. Create a new Electron project using the Electron Quick Start Template.
2. Install the request module using npm to make API requests.
3. Use the BrowserWindow module to load the external website.
4. Implement a select box to select different pages of the external website.
5. Use the request module to make API requests to the selected page and parse the JSON response.
6. Store the JSON data in a local file using the fs module in Node.js.
7. Use dialog boxes to display success or error messages to the user.

Here's a sample code to get started:

const electron = require('electron');
const url = require('url');
const path = require('path');
const request = require('request');
const { app, BrowserWindow, Menu, dialog } = electron;
const fs = require('fs');

// Create a new window
let mainWindow;
app.on('ready', () => {
  mainWindow = new BrowserWindow({
    webPreferences: {
      nodeIntegration: true
    }
  });

  // Load the external website
  mainWindow.loadURL('https://www.example.com');

  // Create a menu template
  const menuTemplate = [{
      label: 'File',
      submenu: [{
        label: 'Save JSON',
        accelerator: process.platform == 'darwin' ? 'Command+S' : 'Ctrl+S',
        click() {
          saveJSON();
        }
      }]
    }
  ];

  // Add the menu to the window
  const menu = Menu.buildFromTemplate(menuTemplate);
  Menu.setApplicationMenu(menu);

  // Select page select box
  const selectBox = document.getElementById('selectbox');
  selectBox.onchange = function() {
    const selectedPage = selectBox.value;
    request(`https://www.example.com/api/pages/${selectedPage}`, {json: true}, (error, response, body) => {
      if (error) {
        dialog.showErrorBox('Error', 'Unable to retrieve JSON data.');
      } else {
        const data = JSON.stringify(body);
        fs.writeFile('data.json', data, (err) => {
          if (err) {
            dialog.showErrorBox('Error', 'Unable to store JSON data.');
          } else {
            dialog.showMessageBox(mainWindow, {message: 'JSON data has been saved sucessfully.'});
          }
        });
      }
    });
  }
});

// Function to save JSON data to a local file
function saveJSON() {
  dialog.showSaveDialog(mainWindow, {defaultPath: 'data.json'}, (filename) => {
    if (filename === undefined) {
      dialog.showErrorBox('Error', 'Unable to save JSON data.');
      return;
    }
    fs.readFile('data.json', 'utf-8', (err, data) => {
      if (err) {
        dialog.showErrorBox('Error', 'Unable to read JSON data.');
      } else {
        fs.writeFile(filename, data, (err) => {
          if (err) {
            dialog.showErrorBox('Error', 'Unable to save JSON data.');
          } else {
            dialog.showMessageBox(mainWindow, {message: 'JSON data has been saved sucessfully.'});
          }
        });
      }
    });
  });
}

Note that this is just a sample code and you will have to modify it according to your needs.