The OST2PST tool is professional email recovery software that can convert offline storage (.OST) files to personal storage (.PST) files. It recovers all email items such as calendar entries, tasks, notes, journals, and folders from OST files. The software restores emails and their formatting in PST, EML, and MSG formats. It allows Outlook users to work offline when Exchange servers are down. The software offers a free demo version and the full version can be purchased for $99.