The best tool to import PST to Office 365 is MacMister PST Converter for Mac & Windows. The application has the ability to batch import PST files to Office 365 at once. Its interface is user-friendly and is programmed with wide ranging features for desired results. With Office 365, the software has numerous features that are helpful in importing PST files to Office 365 according to the requirements. Download the software free demo and import 25 PST files to Office 365 for free.