The search function can be helpful when trying to find a specific email message or calendar entry. When searching with Outlook 2013, there are many options to help you narrow down your search results. Be sure to click on the dropdown box to view which areas you can search within. Also, look at the search tool options to narrow results by subject, category, etc.
For example, below the search has been limited to from:(johannes) subject:(training) and only searching the Current Mailbox.