The Google mobile blog let GMail users know that besides being synchronize their Gmail Contacts and Google Calendar with their iPhone, Windows Mobile and S60 devices contacts. They can now push Gmail to those mobile devices.
It gives over-the-air, always-on connection for an inbox that is up to date, no matter where you are or what you're doing. Sync works with the mobile phone's native email application and noadditional software needed.
For those only interested in syncing in Gmail, but not Calendar sync, Google Sync allows users to just sync Contacts, Calendar, or Gmail, or any combination of the three.
Android users don't need to instale Google Sync because the application is already native on Android smartphones.