WholeClear OST to NSF Converter Software is simple to use, even for those with no technical knowledge, because of its user-friendly interface. It converts big OST files to Lotus Notes NSF format with no data loss. It quickly converts all OST mailbox data to NSF format, with no file size limitations. It is compatible with all versions of Windows, as well as all Lotus Notes and Outlook versions. It also offers a free demo version to all users.