You can now search all messages in your Gmail account with the addition of server search for Google Sync enabled iOS devices.
Google Apps, Google Apps for Business, Government and Education
How to access what's new:
To search messages that are not synced locally, open the Mail app on an iOS device, select a Google Sync configured Gmail account, and search your mail. When the ‘Continue Search on Server’ prompt appears, click it to complete your search.
For more information:
Learn more about Google Sync for iOS on our help center.
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