So after Sparrow acquired by Google, I am looking for new alternatives (except Mail.app and Outlook). There was a product that will be going to be on beta stage few weeks ago, that I read a news about it on here also.
The biggest problem with other MUAs on OS X is Spotlight integration. I would love to have sufficient free time to write an mbox importer for Spotlight, because then you could run dovecot locally and still get the nice searching.
Out of interest, why not stick with Sparrow? It won't cease to work now that development has discontinued, or does it rely on something that Sparrow were hosting?
