OST to PST Converter for Mac Tool will make you available to select multiple Offline OST files and save them to a single Outlook PST after translation. This is an incredibly useful feature if you have Inbox, outbox, sent mail, note, task, journals, and draft, saved in different OST files. This is also capable of scanning and recovery of inaccessible OST files. A free trial version of Mailvita Software is also available to download which helps to convert or few items. The easily runs on Mac 10.10, 10.11, 10.12, 10.13, 10.14, 10.15. Go ahead and download the free Demo version software.