Utilize OST Converter to convert unlimited OST to PST with emails, contacts, calendar, attachments and other mailbox folder items without any trouble. The tool can be used by all types of users and easily understand how to convert offline OST to PST. OST Converter maintains file formatting and folder structure during the process. MS Outlook email app is not necessary for the process. Moreover, all editions of Outlook including Outlook 2021 are well-supported by the application to move Outlook OST data file to PST.