If you do not want to use Outlook for backing up Outlook contacts, then you need to convert Outlook contacts into vCard format to keep stored contacts safely. For the contact migration, you can use this powerful software for contact migration; it is an offline utility which works without any Outlook installation or without any external software. This reliable tool can effortlessly handle multiple contexts in one go. This expert application safely converts PST to vCard without any third-party software or internet connection. I usually use the DataVare PST to VCF Converter for this. It works completely offline and doesn't need Outlook. After the conversion, you can open contacts on phones, Gmail, or even Mac Contacts. i offers a free trail demo all.