📣 Outlook Naggy Reminders (Chrome/Edge Extension)

A Chrome/Edge (Chromium) extension that hooks Outlook Web’s internal GetReminders API and provides extra, highly noticeable meeting reminders.

This extension creates additional reminders at:

• 2 minutes before meeting start
• 15 seconds before meeting start

Both reminders use:

• Persistent browser notifications (requireInteraction: true) → They stay on screen until clicked → They pop up even if Outlook is not focused, minimized, or in another workspace

You can later add more reminders (+30s after start, repeating nags, sound, etc.).

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🚀 Features

✔ Fully automatic reminders

No need to re-enter events manually. The extension hooks into Outlook Web’s own async calls.

✔ Uses Outlook’s internal API: /owa/service.svc?action=GetReminders

This is how OWA itself retrieves the list of reminders.

✔ Works even when Outlook is not focused

Because notifications are from the browser, not from the Outlook tab.

✔ Respects changes

If an event is:

• moved
• deleted
• reminder changed …your alarms update accordingly.

✔ MV3-compliant

Uses a service worker, alarms, and notifications.

✔ 100% local

No servers, no external API keys, no Graph API permissions, no token storage.

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🛠 How it Works

1. page_hook.js runs inside Outlook’s JavaScript world

We inject it as an external script (allowed by Outlook CSP):

• It monkey-patches window.fetch

• Whenever Outlook calls GetReminders, we:

  • detect it
  • clone & parse the JSON
  • forward the reminder list to the extension via postMessage

2. content.js bridges page → extension

It listens for:

window.postMessage({ type: "OUTLOOK_GET_REMINDERS", data })

And forwards it to the background service worker via:

chrome.runtime.sendMessage(...)

3. background.js (service worker)

Maintains a small “snapshot”:

{
  "events": {
    "<uid>": { "subject": "...", "start": "..." }
  }
}

On every update:

• Detects new, changed, and removed meetings.

• Schedules alarms using:

  • chrome.alarms.create(name, { when: timestamp })

• When an alarm fires:

  • Creates a persistent notification.

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📚 File Overview

extension-root/
│
├─ manifest.json              # MV3 manifest
├─ background.js              # service worker (alarms + notifications)
├─ content.js                 # injects hook + forwards messages
├─ page_hook.js               # patches fetch() inside Outlook Web
├─ icon128.png                # notification icon
└─ README.md