Is there a way to add Mozilla Thunderbird to the messaging menu?

I use Thunderbird instead of Evolution for my mail client, so I'd prefer if I could replace Evolution with Thunderbird in the messaging component of the Indicator applet. Does anyone know how to do this?

You want the Mozilla Notification Extensions, aka messagingmenu-extension.

But it will not delete the evolution entry, to do that you need to remove /usr/share/indicators/messages/applications/evolution

The upstream source for the addon is available on Launchpad if you care to inspect it.

Related:

• How can I remove "Set Up Mail" and other entries from the message indicator?

If you want to install the plugin for all users, it's better to use the upstream's PPA:

sudo add-apt-repository ppa:ruben-verweij/thunderbird-indicator
sudo apt-get update && sudo apt-get install xul-ext-indicator

You could also use the generic email notifier 'Popper'. It works with all kinds of POP or IMAP accounts and can launch all email clients (Evolution, Thunderbird, whatever you want). You will find it here: https://launchpad.net/popper Articles and reviews are available at: http://www.omgubuntu.co.uk/ Just search for 'popper'.

My add-on was made to replace to evolution, but If you want remove the evolution indicator and maintain the evolution, only you need deinstall evolution-indicator package (sudo apt-get remove evolution-indicator)

If you want the evolution-indicator back, reinstall evolution-indicator (sudo apt-get install evolution-indicator). You need restart your session after uninstall or reinstall the package