All,
So I think I have finally gotten to the bottom of this issue. After trying the iPhone 4, Samsung Galaxy S4 and the Blackberry (Torch and Z10); the Blackberry Z10 does it all. I have all three of my email accounts (work, MSN and Yahoo) and text messaging connected. I use AT&T service. I can receive emails and text, have them read to me, and then respond to all of them making use of all the capabilities of my 2013 GS 350 technology capabilities. Awesome!
The best I could figure out is that Lexus utilizes QNX technology / application platform http://crackberry.com/press-release-qnx-announces-release-qnx-car-platform-20 to drive the car's technology (which utilizes bluetooth as the basis). QNX was purchased by Blackberry a few years ago and is dominant in the car technology market. Apple does not utilize this standard and limits bluetooth technology to music only and not email. Not sure about Samsung but I know it doesn't work.
The sad part is that Lexus has yet to write the Enform App for Blackberry and has limited the App to Apple and Andriod. Does this make any sense? The car's technology is 100% functional with BB but they write the Enform App for Apple and Android. Crazy!!
I hope this helps. Love my GS 350. I tend to leave work early for long rides to Hilton Head and staying connected with work via email with the ability to respond is super productive. The email responses (there are 15 of them) can be customized when the can is stationary so if you have a need for messages like "approved" or " call my celll at "XXX-XXX-XXXX" you can change some of the 15 to personalize.
Hope this helps.
Jim