Restore to Microsoft 365 Organizations You can restore your Exchange data to Microsoft 365 organizations with enabled multi-factor authentication (MFA). To restore a single mailbox, folder or item, do the following: Launch the Restore wizard. Specify a target mailbox. Select an authentication method. Log in to Microsoft 365. Specify a user account to impersonate with a public folder mailbox. Specify a CAS server. Specify a target folder. Specify restore options. Review the operation summary.