What is a .ABBU file?
The .ABBU file extension is used for a type of file known as an Address Book Backup. This kind of file is created by the Apple Address Book program, which comes with Mac OS X, a type of operating system for computers made by Apple. The purpose of an .ABBU file is to serve as a backup, or a saved copy, of all the contact information you have stored in your Apple Address Book. This is very useful because if something goes wrong with your computer or if your address book gets deleted or corrupted, you can use the .ABBU file to restore all your contacts back to how they were.
To open an .ABBU file, you need to use the Apple Contacts program. This program is included with the operating system on Apple computers, so if you have a Mac, you should already have this program. You don't need to download or install anything extra to open an .ABBU file if you're using a Mac. Just find the .ABBU file on your computer, and you can open it with the Apple Contacts program to restore your address book.
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