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format file abbu

What is an abbu file and how do I open an abbu file?

ABBU is a backup file exported from the Apple Address Book included with Mac OS X. It is used to restore the default address book if needed.

Mac OS
Recommended abbu file download:
Apple Address Book
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Detail abbu file extension information:
File Type: abbu
File Format: Address Book Backup
Primary Association: Backup Files