SysTools has introduced another utility namely, Thunderbird Address Book Converter in a wide range of software. This tool convert Mozilla Thunderbird Address Book MAB into vCard(VCF), PST & other file formats:
Convert MAB file to Outlook PST, vCard(VCF) & PST
You can add & export Single as well as Multiple MAB File at once.
There is no file size limitation for MAB Conversion.