OST file is a Offline store table file which is saved in MS exchange server folder. This file contains all mail data and save it as offline in ms exchange path in c drive. Sometimes our connection breaks from ms server in this case we try to find solution on internet to resolve it. ?Best OST to PST Converter? but don?t get any good result. Some Tools promise they can convert your OST file with their ?OST to PST conversion? but they failed to recover your data. But I want to recommend you a Dux OST recovery software who gives you 110% guarantee to recover and repair your data with their OST to PST converter Tool. If you will not satisfied with their software they also give you money back guarantee within 30 days. They also provide DEMO version of Microsoft ost to pst converter software free of cost. You can try it and convert your 25 mails free of cost. Dux also gives you any time any day live chat support. Dux is work for client?s satisfaction.