The Mailvita OST to PST Converter for Mac Software Users can quickly and easily change Outlook OST files to PST format, and they won't lose any data. The software makes it easy to convert emails, contacts, calendars, tasks, notes, and other mailbox items from OST files that can't be read, are missing, or are damaged to PST files that can be imported into Microsoft Outlook. It works with Windows OS and Mac OS. It's very simple to use, so even users who aren't techy can convert info quickly and correctly. It also keeps the folder layout and email properties from the original OST file when it converts to PST files. It will work with any version of MS Outlook, from 2021 to 2016, and so on. There is a free version that lets users try out the features before they buy the full version.