MailSignal is a lightweight Windows taskbar utility that monitors multiple email accounts (Gmail, Google Workspace, Microsoft 365, and shared mailboxes) and displays the number of unread messages directly in the notification area. There is no need to keep browsers, Outlook, or other heavy Electron-based applications open. It uses secure OAuth2 authentication, encrypts tokens using Windows DPAPI, and never reads the actual email content, only checking the unread count. It is free for 2 accounts with a 5-minute polling interval. The Pro version (a one-time payment of $25 USD) allows for unlimited accounts and polling every 10 seconds.