Email icons missing from the Panel after upgrading to Ubuntu 14.04

I have recently upgraded from 12.04 to 14.04 and then noticed the usual email icon (little envelope icon) which allowed me to run my Evolution, chat and Thunderbird applications is no longer available. Is there a simple way of getting it back?

Solution 1:

As soon as you started your mail application (e.g. Thunderbird) or set up your accounts in the chat application (e.g. Empathy) the message indicator will magically re-appear:

To remove items in the message indicator we can do so by running dconf-editor , remove the application from the key in com.canonical.indicator.messages, and restart our session.