Convert Offline Folder to PST File - Version 3.0 How to perform Exchange offline folder (.OST) file conversion to Outlook (.PST)? Get Outlook OST file recovery tool to convert emails from Exchange Offline folder (.OST) to PST file. Migration of OST to PST process is so easy with SysTools Offline Folder Conversion Tool even if the OST file showing some bland errors like: “Cannot open your default email folders. The .ost is an offline folder file.” Sometimes OST file can unusable due to some situations like deletion of user account from MS Exchange server, virus attack, system corruption etc. But now you can easily overcome from you entire problem and recover your important data from OST file even after these you receive above mention conditions. Software easily convert offline folder in pst file and extract data from encrypted OST files. OST to PST recovery tool easily convert all items of .ost file like emails, journals, calendar, notes, tasks, contacts & attachments etc to PST (Personal Storage Table) file. Move from .ost to .pst file and restores original formatting of RTF and HTML with commendable OST to PST