Yes, this problem is frustrating, especially with large Excel contact lists. I went through the same experience where most tools stopped working in the middle of the process. A friend recommended DataVare Excel to vCard Converter, and it turned out to be very useful. It can handle large files easily and keeps all contact details safe during the process. The Excel to vCard conversion was smooth and fast, and I was able to export Excel contacts to VCF without losing any information. It even maintained the correctness of all the phone numbers, emails and addresses. now, this way we save hours of manual work every week.