You can go with SysInspire OST to PST software. This is one of the best tool for conversion, it can easily recreate OST file in Outlook 2016. It has lots of features such as split PST file option, you can split large PST file in multiple small sizes of PST files. It has email filtration option that can help users to convert emails of selected dates range. It can show live preview before conversion of OST file. It has a bulk conversion feature that can help users to convert OST files in bulk at the same time. It provides free demo version, users can convert 25 files from each folder of OST to multiple formats. It offers technical support 24x7.
If you want to import Outlook OST to Office 365, here I have a tool that can easily import Outlook data, try the most demanding tool which is eSoftTools Outlook OST to PST converter software. This is the best Outlook converter software. It has PST splitting users can split PST files into multiple small sizes and it has a demo version that allows users to convert 25 items from each folder of OST for free. It also recreate OST file in Outlook 2016.
You can also try MacMister Mac OST Converter Tool to recreate OST file in Outlook 2016 and other editions. Its the best GUI-based software that enables you to convert OST file to Outlook PST in a few simple clicks. The software has various useful benefits that preserve the folder hierarchy, formatting, email elements, attachments, and mailbox items in the exported PST file. The tool gives users a free trial version to check out its functioning. Using it, you can export the first 25 items from OST to PST free of cost.