Most of the users are facing OST file corruption issues. So it is advised to convert OST file to PST if the user wants to save all the data. I know there are many OST to PST file converter in the market but choosing the best one is not so easy. I'll recommend you OST to PST File Converter software designed by Data Recovery Solutions which is cost effective and genuine. It converts offline OST file to online PST without any data alteration. It will just cost you around $69 and hence one of the cheapest software in the market.