• Assign Mailbox Import Export role to yourself (can take up to 24 hour to take effect, normally around 1 hour):
    • Exchange Admin Centre > Permissions > Admin Roles. Create a new role:
      • Name: Import / Export
      • Write Scope: Default
      • Roles: Mailbox Import Export
      • Members: <admin name>
  • Go to Office 365 Security & Compliance > Data Governance > Import. Click on New import job and complete a simple wizard (choose Upload your Data option).

  • On the last page:
    • Click Show network upload SAS URL and save the URL for future use.
    • Click on Download Azure AzCopy and download the Azure AzCopy
  • Install Azure AzCopy on a 64bit machine with default settings.
  • Open Command Prompt and navigate (cd) to “C:\Program Files (x86)\Microsoft SDKs\Azure\AzCopy
    • Run following command to upload your PST files:
      AzCopy.exe /Source:"<Location of PST files>" /Dest:"<SAS URL>" /V:"<Log file location>" /Y
    • Wait for the upload to complete. PST files will be automatically deleted after 30 days from the last import job.
  • This step is not strictly necessary, but can be helpful – Download and install Microsoft Azure Storage Explorer and verify that all .pst files were successfully uploaded.
    • Click on Add an Account > Use a connection string or a shared access signature URI > Use a SAS URI and paste you SAS URL
    • Navigate to ingestiondata container where you should find all your uploaded PST files.
  • Download PST import mapping file from: https://go.microsoft.com/fwlink/p/?LinkId=544717. I also saved a copy here.
  • Edit the file:
    • Workload: Exchange
    • File Path: <BLANK>
    • Name: <Name of PST file>
    • Mailbox: <user’s primary email address>
    • IsArchive: False (or True if you importing to user's online archive)
    • TargetRootFolder: / (this imports directly into user's mailbox without any subfolders folders)
    • SPFileContainer: <BLANK>
    • SPManifestContainer: <BLANK>
    • SPSiteUrl: <BLANK>
  • Go back to Office 365 Security & Compliance > Data Governance > Import and continue with the import job where you left (if the original job was cancelled, create a new one).
    • I’m done uploading my files.
    • I have access to the mapping file.
  • Upload PST import mapping CSV file when prompted and click Validate.
  • One validation completes click Save
  • Wait for Analysis to complete and click on “Ready to Import to Office 365
  • Click “Import to Office 365”, then select “No, I want to import everything” and finally “Import Data
  • Wait for the import to complete. Be patient, when I was importing around 10 large PST files it took 5-6 hours for the import process to begin, and then another 5-6 hours to complete.


May 2018
Office 365 / Exchange online



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