Description of problem: Sylpheed 2.2.0 was released on Valentine's Day and the current stable version is 2.2.3.
Oops, I see you already built 2.2.3 in development. Thanks :) Any plans to backport that to FC-5 and FC-4?
It will probably take a few minor releases to become more stable. To jump from 2.0.x to 2.2.x in FE-5 is not a good idea currently, particularly since we don't have a testing repo for that. Also, it would change the look'n'feel quite a lot and remove a few features, which might reappear in future 2.2.x releases. FE-4 will stay at 1.0.x just like FC-3.
Well there have already been a few minor releases and it seems stable enough to me. Further 2.2 has some IMHO "can't live without" features like the message search bar for example, so I'm a bit surprised that 2.2 wasn't included in FE5 but anyway. Am I too bleeding-edge? :)
Too many minor releases in short time. They were necessary to fix some crashes, too, but that's normal because a new major release is given a try by more users. Sylpheed 2.2.3 may be "stable" for simple usage, but overall its not yet as mature as the 2.0 series. Changelog and ML reflect that.
Sylpheed 2.2.x has been made available for FE5 some time ago.