I advise you to try SysInspire OST to PST converter software, it can convert OST to PST, EML, EMLX, Yahoo mail,etc. It has 10+ file formats. It has an email filtration option that can help you to filter your mail by using dates. It can recover accidently deleted OST files even if it can recover corrupt OST files. It has a split option that can help you to convert PST files in multiple small sizes. It has technical support 24x7 by live chat or mail. It has a bulk conversion feature which can convert an OST file at the same time. It has a demo version that can convert 25 files from each folder. It supports all versions of windows.
if you want to Repair the OST file eSoftTools OST to PST converter software. Here I have the best tool that can directly convert Outlook OST files into Gmail. This is the best tool that can recover corrupted emails and convert them into PST files. This software has the best features which allow users to convert 25 items from each folder of OST for free.