craigp I don't see Apple doing much more with Mail.app. I'm just glad that it's still available (it came from NeXT IIRC) and working. I could see Apple replacing it with something from iOS, but not doing much to improve the current app. Email just isn't something that gets a lot of emphasis anymore.
I don't see that they'd buy MailHub either. They'd be more likely to build its features into Mail.app, but not as an add-on or plugin. (And I don't think they're likely to do that as I mentioned above.)
I wouldn't want Apple to buy MailHub either. Things are working ok as they are, and I have more of a voice as a customer of Dervish Software than I would as one of Apple's Mac customers.