How to export PST file to Office 365 account online? Download and use the latest PST file export tool, it helps you to export or convert PST file to Office 365 all along with complete PST files details and attachments. PST file export tool is capable of exporting PST files (emails, calendars, task and more) to Office 365 and other available file formats and web based email clients too. So download free PST file export tool to test its working efficiency, it supports 20+ files at a time.