If anyone searching the best solution to merge PST files into one then I would recommend the KDETools PST Merge. It merges PST files such as Emails, Contacts, Calendars, Notes, Tasks and all. Join PST files without duplicates items. It combines PST files in all Version of Windows and Outlook. Merge PST files without installing of MS-Outlook. It supports in ANSI and also UNICODE formats. Free Version is also available.