Updates-testing (was: Re: thunderbird upgrade - wtf?)

[Bruno Wolff III]

On Wed, Oct 14, 2009 at 13:55:13 -0500,
  chasd <chasd at silveroaks.com> wrote:
> 
> MySQL and PostgreSQL come to mind.

Postgres isn't even updatable. You need to do dumps before doing the upgrade.
So downgrades aren't too much worse than upgrades. (Though the new dumps
might use new features that will need to get modified to make them readable
by old versions.)