The Microsoft OST to PST Converter Software helps convert an OST (Outlook Offline Storage Table) file to a PST (Personal Storage Table) file. This conversion is useful when you want to access your OST file data in Outlook or another email client, change the OST file to PST format, or move your OST data to a different email format or service. The Microsoft OST to PST Converter is considered one of the best tools for converting OST files to PST format by Microsoft MVPs.