If you want to convert Excel contacts to vCard instantly with no duplication, I can suggest a reliable and most recommended tool that can convert any number of  Excel files to VCF format instantly. For the best and fastest conversion, try the SoftakenSoftware Excel to VCF Converter, which can simply convert an Excel file to standard vCard format without any duplicate files. This tool saves all contact details like full names, job title, email address, company information, country name, zip code and more. You can run this software on any Windows version from 11 to 7, 32-bit, 64-bit, XP, and Vista. To convert Excel contacts to vCard files, you do not require any third-party or alternative program because it has multiple options, like field mapping, see a preview, and choose a filtering option. And you can first convert a few Excel files to a vCard file for free.