One of the problems that Google has faced with the fight to pull users from their Exchange environment to Google Apps was the ability to Sync Email, Contacts and Calendar appointments to a user’s Windows Mobile Phone.
Google released Google Sync (http://www.google.com/mobile/products/sync.html) earlier in the year but it only supported Calendar and Contacts. They have now released an update that will also support pushing Email to any device that supports the Microsoft ActiveSync protocol. With this addition to their arsenal of features the Google Apps solution may turn into more of a threat to other well established enterprise email solutions.