Gmail Notifier Pro gives a complete overview of all unread mail in all your mail boxes and support secure Atom and IMAP protocols for mail retrieval. It will also let you write and reply to mail without opening your browser, and can be registered as your default mail handler. It also include integration with Google Contacts, scheduling, can run from USB and supports automatic updates.
What's new in this version:
Version 5.2.4 introduces a new Google Calendar interface that replaces the old interface that was discontinued by Google. This will correct the problems with Google Calendar that many users experienced the last few days.