The advances in technology have provided it simple to combine two PST files into one. OSTtoPSTAPP Merge PST Tool is what I recommend. Using this program, you can quickly and simply combine all of your PST files into one file that you can access on your computer from any location. Also, using this program doesn't need any prior technical knowledge. For combination processes, this application works with both ANSI and UNICODE PST files. When you combine two or more Outlook PST files into a single Outlook PST file, you retain all of your contacts, calendars, tasks, events, attachments, and other data. The program works with all versions of Windows. A free demo version of the application is available for download.