Sync Outlook with Google, SOGo or any other CalDAV / CardDAV server
Mail Notifer for Windows
Python mail notifier for linux
Email Notifier For Windows
Thunderbird tray icon add-on
System tray unread mail checker for Linux
System tray IMAP account checker
A Light and Efficient Tray-Based Email Notifier for Windows
Be aware of new message in your mailbox
A program that sits in the tray and notifies you of new emails
MailChecker - The simplest way to check your multiple webmail accounts
Active Directory password expiration notification tool