The NSF files are lotus notes files containing emails, archives, contacts and calendar events. Merging of NSF files is applicable to these elements contained in the file. The merging of two NSF files into single one saves space in storage area. The NSF merge tool can perform this with ease by merging two files in quick time. There would be manual methods available but they would be tedious and confusing so go for this tool for performing effective merge of two NSF files.