I've been using Postbox for 4 1/2 years. It's good, but always had significant bugs (e.g. when it would grind to a halt while indexing emails). Once or twice a

I've been using Postbox for 4 1/2 years. It's good, but always had significant bugs (e.g. when it would grind to a halt while indexing emails). Once or twice a day I'd have to restart it so it would be useable. I know nothing beyond the press release, but my guess is that there are fundamental problems with the codebase that they couldn't fix without putting a while lot of time into it, and they just couldn't justify the time.