Archived email is available through Outlook as an Online Archive mailbox. This additional mailbox can hold 100 GB of archived emails. 

Any mail over 2 years old will automatically move to the Archive Mailbox in the same folder structure as your standard mailbox.  The Archive Mailbox will hold all emails that are between 2 and 10 years old.

Once an email is over 10 years old it will be automatically deleted and unrecoverable.  

You will see this mailbox, listed as Online Archive-Username, at the bottom of your available Mailboxes in Outlook below your Inbox or as In Place Archive - Username if using a web browser to access your mail online.

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