Each major service has a specific path for downloading your contact data: How To Download Outlook Address Book [Guide]
To download an address book, you generally need to from your email or cloud provider into a portable file format like CSV (for spreadsheets and Outlook) or vCard/VCF (for Apple and mobile devices). This process serves as a critical backup and allows you to move your contact list between different platforms or devices. How to Download from Major Platforms to download address book