Android smartphones store contacts in a vCard file, but sometimes vCards do not work right in Outlook. That would be the format or version of the file. Outlook must have contacts in a method it understands. You can use Third-party apps, for example, WholeClear vCard Splitter Software. This application takes the large contact file and breaks it down into small contact files. Each file will have one contact. This is more convenient to add contacts in the Outlook application. The application can work without having an internet connection and keeps your contact information secure: names, numbers, and emails. It is a very simple and helpful tool for all types of users.