After reading the notice at the top of http://www.mozilla.com/en-US/thunderbird/all-older.html that as of today TB 1.5 will no longer be supported, I was thinking whether it would make sense to drop support for the TB 1.5 series after the 0.7 release.
I see the following reasons for this:
- As the TB 1.5 core code is pretty old, it hurts in a variety of places. See bug 330121, bug 351997, bug 389384 or bug 397920 for examples
- We have a very small team of core developers. And testing changes on TB 2, TB 1.5 and Sunbird puts a great burden on their shoulders. Dropping TB 1.5 from the requirements list would ease that burden
- Our testing community uses TB 2 almost exclusively, so TB 1.5 specific bugs are often found very late if ever
- Most Thunderbird users will probably already have made the switch to TB 2. So we wouldn’t lose lots of users here
I would be interested in hearing your feedback on this.