Exchange Online Archiving archives email from your primary mailbox in order to reduce its size. It creates an additional mailbox known as an In-Place Archive or Online Archive that works in tandem with your primary mailbox.
Emails move from your primary mailbox into your online archive automatically after they reach a certain age (typically 1 year). They move into the equivalent folder in the Online Archive, so if you create a folder in your primary mailbox, it will be created for you in your online archive. Since the archive size is unlimited, this means you can store an unlimited amount of email once an archive mailbox has been created for you.
The Archive will appear below your other folders in Outlook on PC or Outlook on the web.
The easiest way is to click in your Archive inbox, then use the search bar at the top. You can also click on folders to browse emails in the archive.
