OST Explorer to PST - Version 4.3 OST Explorer to PST software effectively works on Offline mode to simply recover OST files from Exchange Server after loss of Exchange Server connectivity. If you can not open your Personal Folders file (.pst) or your Offline Folder file (.ost), or you suspect that your .pst or .ost data file is corrupted in that situation Import OST into PST software converts OST files into three format like PST, MSG and EML, which can be easily open in MS Outlook all versions.The Transfer OST to PST Tool works on the entire Windows platform to easily recovers OST files, which is created by Exchange Server as well as convert OST file into PST files format that you can easily open all versions of MS Outlook. Download the Demo Edition of this software to test the performance and ability of the tool after that purchase full version at only 99 USD.