Almost everything I saw from Microsoft at the show was pretty impressive. But Sync was underwhelming.

Sync is Microsoft's technology for integrating technology into cars. It's a great idea. But the execution is the problem. 

The Sync issues are similar to the issues I have with Windows Mobile. Over-engineering, design by committee and inelegant.

Their demo of voice recognition really highlights the klunkiness of the system. (paraphrased)

Person: Phone

Car: Phone ready

Person: Dial Mom

Car: You said Mom, correct?

Person: Yes.

Car: Did you want to dial Mom on cell phone or home phone?

Person: cell phone

Car: You said cell phone, correct?

Person: Correct

Car: Dialing mom cell phone.

...

In between each of those transactions is a beep the user must wait for to begin speaking.

It's just tedious.  I much prefer to just use the on-screen display to dial whomever. But almost everything in Sync struck me as being needlessly catered to very possible user.  One can almost imagine someone in a meeting in Redmond saying "Oh, we really should also include support for X" resulting in everything being more complicated.