• 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.
  https://azure.microsoft.com/en-us/features/storage-explorer/
  • 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).
  Select:
  • 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