Parameter "CurMailFileDir" can be used to achieve this.
See further details below:
[General] CurMailFileDir=<Path>
Identifies the root of the source subtree the program will scan to find mail .nsf files for migration. For example:
CurArchiveDir=c:\lotus\notes\data\mail tells the program to look for mail .nsf files in c:\lotus\notes\data\mail, and in all subfolders thereunder.
