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Files with the extension .ABBU are known as "Address Book Backup".

This backup format was added to our database by a visitor to this site, but no additional information was provided.

We have yet to investigate the ABBU file extension any further, or there was simply not enough information available at the time to report accurately on the format. If you know how to open ABBU files or even how to convert or edit them, please use the form below.

However, it is possible that other file formats exist which also use the ABBU extension, so please let us know if you do not think the ABBU extension matches the file format you are looking for.