The Desktop Notifier is available only if you are running Web-Based Email in Windows. You get instant notifications when you receive new messages in your Web-Based Email account.
To Install Desktop Notifier
NOTE: If you are running Windows and using Internet Explorer, when you install the Desktop Notifier, you also enable the Image Paste and the Multiple Download features. For more information, see Copying and Pasting Content and Images Using Internet Explorer and Downloading and Viewing Message Attachments.