Tutorial on best way to enable Auto-Expanding Archive for your Office365 Mailbox.
Step1)D/L
https://www.powershellgallery.com/packages/ExchangeOnlineManagement/3.0.0
Step2) Connect to Exchange Online PowerShell
Run command: Import-Module ExchangeOnlineManagement
Step3) Run:
Connect-ExchangeOnline -UserPrincipalName
[email protected]
Step 4)run Enable-Mailbox "user mailbox" -AutoExpandingArchive
Step5) Check if its enabled Finale check
Get-Mailbox "user mailbox" | FL AutoExpandingArchiveEnabled