Do you like options? You have two! See the empty white rectangle in the upper right corner of your Mail window? Click in it and type what you’re looking for. Then click Web Search.

If the above suggestion is too easy, then type in the search box above your message list and then click Search the Web.

A new window opens with your Search results! After getting the information you want, you can click back to your Mail page, which is still open. Yeah!