Reference:
https://docs.microsoft.com/en-us/azure/active-directory/governance/create-access-review

Explanation
References:
https://docs.microsoft.com/en-us/office365/securitycompliance/faqimporting-pst-files-to-office-365 You can use the Office 365 Import Service to bulk-import PST files to Office 365 mailboxes.
When you use the network upload method to import PST files, you upload them to an Azure blob container named ingestiondata. If there are no import jobs in progress on the Import page in the Security & Compliance Center), then all PST files in the ingestiondata container in Azure are deleted 30 days after the most recent import job was created in the Security & Compliance Center.
Reference:
https://docs.microsoft.com/en-us/office365/securitycompliance/faqimporting-pst-files-to-office-365

Explanation
When initially deploying new Windows devices, Windows Autopilot leverages the OEM-optimized version of Windows 10 that is preinstalled on the device, saving organizations the effort of having to maintain custom images and drivers for every model of device being used. Instead of re-imaging the device, your existing Windows 10 installation can be transformed into a "business-ready" state, applying settings and policies, installing apps, and even changing the edition of Windows 10 being used (e.g. from Windows 10 Pro to Windows 10 Enterprise) to support advanced features.
Reference:
https://docs.microsoft.com/en-us/windows/deployment/windows-autopilot/windows-autopilot