I checked with a Microsoft Product Support Services (PSS) contact of mine on this for you and the response I received was: "You probably need to contact PSS to get Pubmerge."
Since there is still a 2 GB limit in the Pubmerge tool, you may be better off using a .PST file (created with Microsoft Outlook 2003 so that you get the Unicode .PST file with the larger 20 GB capacity), or simply dragging and dropping within Microsoft Outlook.
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