Starting with tomorrow's Alpha 2, the upcoming Ubuntu 11.10
(Oneiric Ocelot) operating system will feature the highly
anticipated Mozilla Thunderbird 5.0 as default mail client.
We know that some of you Ubuntu lovers out there wanted
Thunderbird as the default mail client for Oneiric, but there are
many others that still love Evolution Mail, which at the moment is
no longer installed in the current development version of Ubuntu