Title: If you are interested in the internals of such a piece of software, check out the code. or even better fork it and fix the bugs :-)<p>Some info:
- Pretty decent amount of press: http://www.inbox2.com/press
- About 100K downloads
- Built by 1 dev, 1 part-time interaction dev and 1 designer, all pretty much during the evenings and weekends
- Beautifully looking, but nevertheless a commercial failure because nobody will pay for email (now paying for <i>data</i> is a whole other story)
- Learned more while building this thing then in all my previous ~10 years of consulting combined
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