I have the best solution for your issues regarding to OLM to PST converter me recently working for OLM to PST Converter tool which was suggested my friend. OLM to PST tool is more compatible with window 10 and office 365. You can split PST files into smaller parts. It provide 100% safe and secure conversion results.
Convert all element of OLM Emails to outlook PST Platform.
It allow multiple saving formats like PST, EMLX, MBOX, PDF, HTML, MSG etc.
Migrate OLM to Exchange server, Gmail, Gsuite, Office 365.
It compatible with windows operating system XP, Win7, Win8, Win10.

http://www.howtosol.com/products/olm-to-pst/