Tagging the last common changeset of mozilla-central and mozilla-1.9.2. The tagged changeset represents the branchpoint of the two.
551f3e42e5a662e307dc02a68abd90d3a765a583 THUNDERBIRD_3_0b1_RELEASE
551f3e42e5a662e307dc02a68abd90d3a765a583 THUNDERBIRD_3_0b1_BUILD1
f0da4aabc3a13f512048888fd2d80a653781ebfe GECKO_1_9_2_BASE