You cannot exactly convert .vcf files to .eml files. The first is contacts list, the second is email message. As best you can import contacts to your email client and write a new message to one of the contacts from the list. But conversion is not possible.
Note: Some programs use .eml files for contacts. In this case it should be possible.
This conversion entry was verified by us and conversion was flagged as wrong or not possible.
Usually this happens when the conversion would try to convert different types of data between each other, such as audio to image, or it is not possible because incompatibility between programs, caused by closed file formats, very limited support etc.
If you find entry that you feel is flagged as bad wrongly, please tell us in the discussion below with as much as information as possible so we can fix it.