ZOOK OST to PST Converter is a top performing OST to PST Converter having user-friendly interface and many advanced features. Which makes it reliable and easy to use tool to transfer all the data including emails, contacts, calendars, notes and all other items from OST files to PST file format. It is able convert large OST files into PST format without compromising with the data integrity and original folder hierarchy. This tool fully supports all available versions of Microsoft Outlook and Windows Operating Systems.