If you delete Outlook, you can't open OST contact files directly on your PC because they are linked to Outlook and Exchange. They look unreadable without Outlook. You need to convert your OST into a format that works on all devices, such as VCF (vCard), to get to those contacts. Windows, Android, iOS, and practically all email services can open and use VCF files; therefore, they are easy to use. You can open vCard files without Outlook. If you want to convert OST files to VCF files, then try TrustVare OST to VCF Converter tool. This tool supports bulk conversion of files. While converting it will save all your information, it will convert multiple OST files to a vCard file in simple steps without changing the format. Additionally, you can convert a few OST files to VCF files for free, check their features, and how it works.

Visit here: https://www.trustvare.com/contacts-manager/