What is an ".abbu" file and what does it do?

A file showed up on my esktop named "Address Book -......abbu".  What is it and can I delete it?

It is an Address Book archive file.  You can make one by selecting File>Export>Archive while in the Address Book app.  It has a date next to the name to indicate when it was made. 
I always keep a recent one of these archive files in a backup folder, together with similar archives for iCal, Google Earth Places, Safari Bookmarks etc.  They can be a godsend when things go wrong.

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