Now, most of the users are quite dependant on the desktop-based email applications to completely deal their mails. A diverse sign of email applications clients are existing in the activity similar; Microsoft Outlook, IBM Lotus Notes Outlook Verbalise, Novell GroupWise, etc. As there are numerous of email applications gettable in the onfile arena. All these email clients tally diametric file extensions to outlet the data on the tool. Tho' MBOX is the file format, which is verified by various of email applications. On the different laborer, NSF is the file formatting that is exclusive verified by IBM Lotus Notes for the mail direction. Nonetheless, there are some situations arises in figurehead of users due to which they necessary to impoverishment and way to perform MBOX to NSF transmutation.