There is only one file type that uses the .NA2 extension:
Netscape Address Book File

- Developer Mozilla
-
Popularity
- Category Misc Files
- Format Binary
Address Book used by the older Netscape Communicator Web browser and email program, as well as the newer Mozilla SeaMonkey application; stores a collection of contacts; usually has the filename pab.na2.
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Updated: March 29, 2011