While there are many commercial tools that will convert between various email formats, for NSF to PST conversion, John Randall of Randall Consulting provides the following warnings:
Subject: Lotus Notes to .pstFrom: John RandallDate: Mon Jul 28, 2008 10:58 pmURL: http://www.litigation-support.org/viewtopic.php?t=16502
You should be very careful of any migration tool that converts .NSF to .PST. Do not [...]
FRCP Rule 37(f)’s Safe Harbor provision often raises the question of what retention and disposition policies will be acceptable. Specifically it states:
FRCP Rule 37(f) Electronically stored information. Absent exceptional circumstances, a court may not impose sanctions under these rules on a party for failing to provide electronically stored information lost as a result of the [...]