"You were more than 16 000 helping us on our Apple quest to get the VoIP privilege. We can't thank you enough for your support. Unfortunately, Apple has confirmed that they are not willing to do any exception to the rule and that Sparrow will NOT be granted with the privilege." The developers are talking about a special API (application programming interface) that only Apple is allowed to use. Not being accessible to third-party developers, this API is out of reach for Sparrow, which means "we'll have to do Push on our side and that it will be integrated as a yearly subscription into Sparrow's future update," the developers said. The company's blog entry announcing the new release also confirms an upcoming Sparrow 1.6 for Mac OS X. No new features are dished out, but it seems the Mac update is not far off. Download Sparrow for iPhone and iPod touch