To convert multiple OST contact files into VCF files that can be uploaded to Zoho Mail Contacts, you first need to select contacts from the OST file. You can't export OST files straight into Zoho because they are exclusive to Outlook. The best thing to do is convert all of your OST contacts into VCF format, which Zoho Mail can easily read. After you convert the contacts, you can log into your Zoho Mail account, go to the Contacts area, and import the VCF file all at once. In this manner, all of your contacts can relocate safely without making copies. You can use an expert application like TrustVare OST to VCF Converter to make the procedure go more smoothly. It accurately converts a lot of OST contacts into VCF files that are suitable for Zoho. While converting it will not erase your data.