Free OST to PST Converter. Convert OST to PST, even if files are inaccessible. OST2 Free Edition can convert up to 5 items in each folder of orphaned OST file. Also, with Free OST2 it is possible to scan for .OST files which are connected to Microsoft Outlook. Using OST2, you can import and export OST and PST files, data from and to Microsoft Outlook, Exchange, Office 365, Outlook.com, Google and G Suite. You will be able to choose a specific OST or PST file or you can scan your computer and OST2 will find all OST and PST files. The Free OST2 version allows you to transfer up to 5 items from each folder. Using Enterprise Edition convert and trasfer all OST files which are linked or unlinked to Microsoft Outlook. Use OST2 to transfer data from Exchange to Microsoft Outlook, make your Exchange account emails, calendar, contacts and other items accessible through Outlook. To prevent Offline Storage .ost file's data loss, back up data as a PST file. In case of the Exchange Server crash, downtime or accidental user account deletion, you will be able to recover Exchange mailbox folders by opening the converted PST file in Outlook. Convert files in a couple of clicks - select an OST file and choose the location where you want to save the PST file.