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Outlook is very precise when it comes to the formatting of vCards, and it almost always rejects those files that are not arranged in a standard way. In general, users have this kind of trouble when they use an online CSV to VCF converter tool that creates a VCF file in a way that is incomplete or not properly formatted. Fixing this problem starts with making sure that your converter supports field mapping correctly, UTF-8 encoding, and vCard 3.0 format since that is the version Outlook is most compatible with. When the issue keeps happening, it is probably better to import a VCF file to Google Contacts at first since Google is very likely to correct the format by itself. Even so, the safest method is to do a change with a reliable tool such as GainTools CSV to vCard Converter that can simply produce a vCard file that works with Outlook. Proper CSV to vCard conversion is a way of ensuring that the headers are tidy, the fields are turned into the right place, and there are no problems in the importing process. It is also good practice to always verify whether there are empty columns or commas placed in the wrong way in your CSV because these are the factors that will lead to errors during the import process.
