I would recommend OST to PST Converter tool to perform OST to Office 365 migration. This is a very advanced tool and provides you many advanced features. By using this tool, you can convert OST to PST, Zimbra, Gmail, EML, EMLX, vCard, ICS, MSG, Office 365, Live Exchange server, MBOX and etc. The software is compatible with Windows OS and supports all versions of MS Outlook, including Outlook 2019.
Features software of KDETools OST to PST Converter
1. No file size limitation
2. Message filtration Option.
3. Acquire a free preview.
4. Conversion of Selective item.
5. Split option.
more info- how to import ost to pst manually
If you search the best ost to pst migration tool try stella ost to pst converter software to migrate your ost file data in to pst file. Stella ost to pst migration tool migrate all the email items, contacts items, calendars items, task items, notes items and many other items of the ost file in to pst and eml, msg and office 365. For more info visit this link https://www.stelladatarecovery.com/ost-to-pst-recovery.html
ATS OST to PST Converter can safely convert OST files into Outlook PST file format without losing any data. It offers multiple formats for the OST file conversion such: MBOX, EML, MSG, PST, EMLX, etc. It has a user-friendly interface and it provides a free demo version that allows the users to see the preview of recoverable data. This software is a Windows-based tool and this software all Windows operating systems such as Win 10, 8, 7, XP, Vista, etc. Avail the demo version of the converter so that you can convert 30 emails without any payment.