Google stopped the support of Microsoft ActiveSync Exchange, which for users of non-Android devices are more difficult to view contacts, calendars and push e-mail of Googles services to sync. Google recommends carddav, caldav and imap.
Google advises users of non-Android devices to caldav for calendars, carddav for contacts, and imap for e-mail use, and iPhone users can also use the Gmail app for push e-mail. For Windows Phone 8 users, it is more difficult: that OS supports the caldav and carddav protocols not yet, also there is no Gmail app, and from the statements of Google implies that there are no plans to create it. They can however Gmail sync via imap, but then they miss a push-mail. For users of the Google Apps business service, nothing changes; this remains Google new Sync users accept.