If are you looking best tool for importing PST files to Office 365 you can try this Aryson PST File Converter Tool. This tool is the most efficient tool for importing PST files to Office 365 and many more email clients such as Outlook PST email to Thunderbird, Gmail, IMAP, Hotmail, Yahoo, & Opera Mail successfully. It also can convert PST, to EML, PDF, TXT, MSG, MBOX, HTML, EMLX, MHTML, etc., file formats with ease. It maintains the folder hierarchy during conversion as per the browse PST file structure.

If you want to learn how to export Outlook contacts from OST to vCard/VCF format, use the professional solution ToolsBaer For Address Book Manager Software. This application is among the best for finishing the process fast and in a few simple steps. It works with all Windows editions, including XP, Vista, 7, 8, 8.1, 10, and later updated versions. On top of that, it can convert Outlook OST files from any version—2019, 2016, 2013, 2010, and earlier editions—to another format. The tool can also split and merge VCF connections without the need for any further software. To access further features, download the free trial version of this application.
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Aryson PST to NSF ConverterTool helps you to convert Emails, Contacts, Calendars, Tasks, Journals, and Notes from Outlook into IBM Lotus Notes without Outlook installation. The software migrates Outlook emails into Lotus Notes, Office 365, IMAP, Exchange Server, Gmail, Yahoo & AOL. It saves emails from Lotus Notes (NSF) files into PDF, DOC, TXT, CSV, DOCM, COCX, TIFF, and Images. This tool exports bulk PST Files to NSF Format through Multiple File options.