You can combine multiple PST files into one with the Mailvita Merge PST for Mac Tool. This is the expert solution to easily combine multiple Outlook PST files in a single PST file. It effortlessly merges large sizes of Outlook emails, attachments, contacts, calendars, notes, tasks, and events into one document. It supports all editions of the Mac OS versions such as 14, 13, 12, 11, 10.15, etc. User can keep their database files during the merging Outlook PST files process. It has an easy-to-use interface for all users. It provides 24/7 customer support. Customers can use the free demo versions to check out the software before buying it.