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Ensure additional storage providers are restricted in Outlook on the web

Remediation Considerations​

MaxScoreImplementationCostUserImpact
5UnknownUnknown

Remediation Impact​

Impact associated with this change is highly dependent upon current practices in the tenant. If users do not use other storage providers, then minimal impact is likely. However, if users do regularly utilize providers outside of the tenant this will affect their ability to continue to do so

Remediation​

Restrict additional storage providers are restricted using PowerShell:

  1. Connect to Exchange Online using Connect-ExchangeOnline.
  2. Run the following PowerShell command:

Set-OwaMailboxPolicy -Identity OwaMailboxPolicy-Default -AdditionalStorageProvidersAvailable $false 3. Run the following Powershell command to verify that the value is now False:

Get-OwaMailboxPolicy | Format-Table Name, AdditionalStorageProvidersAvailable