Microsoft Outlook uses OST file to save and access data in offline mode. This Outlook offline data file (ost file) allows users to work in offline mode and save work data. Next time when the connection is available, MS outlook automatically synchronize all work and changes with Exchange Server. Here some time while working offline OST file damaged due to Outlook unusual shutdown or synchronization error and many others reasons. To fix OST file and recover all data, OST to PST Converter tool is the best option. This Software not only recovers Outlook emails and other data from OST file but also convert to PST and many other formats. Here if you have an Office 365 subscription, then you can also export recovered data from Outlook OST file to your Office 365 account.