How to search in Outlook - Microsoft Support
support.microsoft.com › en-us › officeWhen you type words into the Search box, Outlook scans both email messages and many types of attachments for that word or phrase. For example, if you search for "project" either with or without quotes, Outlook will return all messages with the word project, projects, projector, projecting, etc. anywhere in the sender name, subject, message body, or attachments.