.Google has announced that they will stop supporting Google Sync in Gmail from the 30th of January 2013, Google Sync is used to access Google Mail, Calendar and contacts via Microsoft’s Exchange ActiveSync protocol.

What Google are basically doing is withdrawing support for Microsoft Exchange, and from the 30th of January you will not be able to setup a new account with Google Sync.

Google Sync was designed to allow access to Google Mail, Calendar and Contacts via the Microsoft Exchange ActiveSync® protocol. With the recent launch of CardDAV, Google now offers similar access via IMAP, CalDAV and CardDAV, making it possible to build a seamless sync experience using open protocols. Starting January 30, 2013, consumers won’t be able to set up new devices using Google Sync; however, existing Google Sync connections will continue to function. Google Sync will continue to be fully supported for Google Apps for Business, Government and Education. Users of those products are unaffected by this announcement.

If you have an existing Google Sync account you will be able to continue to use it, Google has not given any details on how long the service will be available to existing users.

Source Google