The day before Google rolled out a new function for Google searchers - they can see information from Gmail inbox\sent messages right in the search results. But don't worry premature. Only enrolled users are able to see these messages. And the content won't be shown.
So, you've decided to participate in the program. You do your search and you matching messages that are along the right side of the screen. Let's look up close?
Well, an editor-in-chief of Search Engine Land Danny Sullivan decided to probe this function and searched for 'Barry Schwartz' - by the way, he is the news editor at Search Engine Land. As the both editors had a contact through Gmail, one of those messages has appeared in search results. But the content wasn't shown. This is the way Google protects personal information of users.
As Sullivan developed, having tested this function, it works the best with flight-related information. If you are looking for “flights,” you'll have emails, for example airline confirmations:
“Google is smart enough to figure out if you’re about to fly and give you tracking information.”
Data from Google App accounts won't appear in search results - it doesn’t operate with the field trial. But it is possible to forward all your email from a Google Apps account to a Gmail account, as a back way. You can't search for any of those replies in that way.
If you want to apply in the trial, it is open to the first 1 million people. If you don't want to participate, you can disable this function simply on the same page. Remember - no one will be added to the program automatically. And if you take part in this program, you will not be exposing your email in search results to the entire Internet.