Since Lotus Notes program doesn’t support PST file, you must convert PST to NSF format. You should use PST to NSF Converter to migrate your personal email
data, contacts and other information from Microsoft Outlook to Lotus Notes without any external support.After migration from Microsoft Outlook into Lotus Notes, utility efficiently keeps the original structure of folders and files unchanged. It won’t make any alterations in .PST file hierarchy after converting them in subsequent file. For more Info - http://www.undeletepcfiles.com/pst-to-nsf-converter.html