Today my friends suggest me about SysInspire OST to PST File Converter Software.This software is best to convert all the OST file into PST and also best for split OST file into small PST file.you can use it for free demo and save only 25 items from each and every folder of OST mailbox.In this software you convert the OST file items from the exchange environment of OST ,IMAP,Outlook.com and office 365.I suggest you to download and use for free demo.

Read more : Outlook free OST to PST File Converter