From the BlogCONTACT US

You can now search attachments in Google Apps email

Outlook and Yahoo users have been able to do it for years but now Google Apps and Gmail users can search not only email but email attachments. Previously, the popular email client only allowed search within the text of the email itself, but now users can search within files from programs such as Adobe Acrobat, Microsoft Office files and more.

To try this out for yourself, simply add “has:attachment” to the beginning of any keyword query. Limiting the search to a specific file type involves adding “filename:(file type)” to the search term.