Inside the report it states:
UnreportableReason: This is not a genuine Ubuntu package
In synaptic; it shows the Ubuntu Icon next to the package name; which
implies it's an Ubuntu supported package. Unless I have misunderstood.
The version tab in synaptic shows:
2.0.0.23+build1+nobinonly--ubuntu0
Public bug reported:
Binary package hint: thunderbird
1)Description:Ubuntu 9.04
Release:9.04
2)Installed Version: 2.0.0.23+build1+nobinonly-0ubuntu0.9.04.1
3) I expect Thunderbird not to re-download all data from all my RSS
feeds.
4) It downloads ALL messages; not just updated mess