I am currently trying out Thunderbird 128.2.3esr (64-bit) on windows 10 home version 22H2. I have been using Mailbird. I exported my address books from mailbird to .vcf format with the "settings" "Selected Groups" "Export contacts to vCard". I have viewed the .vcf files in Textpad and all seem correct. When I try to "Address Book" "Import" "vCard File" the import completes successfully. But when I look at the list of contacts only several show names. The rest are blank and when I click on the blank contacts in the list the right hand pane is also empty of values. I tried multiple times with different .vcf files with the same result. So I broke the .vcf files apart thinking that it could only handle so many at a time. Nope! some of the .vcf files import. Most import and create a blank contact. Each of the vCard files has a possibly different set of fields and I can not see a pattern in the ones that are accepted compared to the ones that are not. Help please. p.s. I have the plain vanilla Thunderbird with no extensions.