You want to merge Outlook PST files I suggest the Softaken Merge PST Tool to securely merge all messages and other vital databases in Outlook PST format. If you have many Outlook PST files, this software will make them all viewable at once. This software allows you to quickly and easily merge numerous Outlook PST files into a single PST file. This tool can merge PST files for users of any ability level, including professionals. It also includes the following properties: contacts, calendars, emails, notes, tasks, events, and attachments. It is compatible with all Windows OS versions.