{"id":6577,"date":"2026-06-18T10:31:53","date_gmt":"2026-06-18T10:31:53","guid":{"rendered":"https:\/\/www.macsonik.com\/blog\/?p=6577"},"modified":"2026-06-18T10:32:13","modified_gmt":"2026-06-18T10:32:13","slug":"convert-ost-to-vcf","status":"publish","type":"post","link":"https:\/\/www.macsonik.com\/blog\/convert-ost-to-vcf\/","title":{"rendered":"What Is the Best Way to Convert OST to VCF? Expert Guide"},"content":{"rendered":"\n\n
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User-Query:<\/strong><\/p>\n

“I have a 14 GB OST<\/strong> file from Outlook 365. It contains approximately 8,500 contacts<\/strong> along with around 95,000 emails<\/strong>, calendar entries, tasks, and other mailbox data. I need to extract the contacts and convert them to VCF (vCard) format. All contact details must be preserved during the conversion. What is the safest and most reliable way to convert OST to VCF<\/strong> without data loss or formatting issues?”<\/p>\n

— Posted by ‘Michael Turner’<\/strong><\/p>\n<\/div>\n

Introduction:<\/strong> OST is a mailbox file format used by Microsoft Outlook to store synchronized mailbox data for offline access. It contains emails, contacts, calendars, notes, and other mailbox items linked to an Outlook profile. However, OST files are not directly accessible outside Outlook and are dependent on the original profile. A VCF (vCard File) is a contact file format used by platforms such as Apple Contacts, Gmail, and many CRM systems. Converting OST contacts into VCF makes it easier to transfer and back up contact information across multiple devices and applications. Therefore, this guide explains the various ways to convert OST to vCard seamlessly using the MacSonik OST File Converter Tool<\/a><\/strong>.<\/p>\n