In the Mail view, type the search criteria received: May in the Instant Search box, and then specify the search scope in. For example I need to archive emails received in May, I will show you the detailed steps to archive by the specified month/date/year in Outlook.Items that Outlook archives aren’t lost forever, though. Outlook calls sending these items to the Archive folder autoarchiving. In some cases, Outlook puts email messages, tasks, and appointments older than six months into the Archive folder - a special folder for items that Outlook thinks are stale or not worth keeping.