Migrate PST files to Exchange and Office 365
Steps: Give import/export privilege to the user (Exchange > compliance > import/export) Office 365> import> upload file over the internet > Download Azure AzCopy tool for Azure uploading ( Microsoft Azure AZCopy Tool ) Copy the secure storage account key Use Microsoft Azure AZCopy tool to upload your data create CSV file uploading files access to the mapping file Reference : https://support.office.com/en-us/article/Overview-of-importing-PST-files-and-SharePoint-data-to-Office-365-ba688e0a-0fcb-4bd7-8e57-2b669564ea84?ui=en-US&rs=en-US&ad=US&fromAR=1