Sometimes while Importing PST file Office 365 shows 403 error. It's better to use a safer method by using Office 365 Import tool. It is fast as well as a reliable method than AzCopy. 5 Steps to handle Office 365 Import Failed problems are: Step 1: First Install Office 365 Import Wizard Step 2: Enter Office 365 User or Admin credentials Step 3: Import Outlook PST file by using Add File(s) or Folder option Step 4: Apply Filter and select Category of data to Import Step 5: Finally click on Import button to finish the process