.EDB File Extension

Database created by Microsoft Exchange Server; serves as the main repository for the mailbox data saved by Exchange; stores both in-process and stored non-SMTP messages; formatted using a b-tree structure, which includes a top level node and many child nodes.

Priv1.edb and Pub1.edb are the main EDB files used for the Exchange information store. They each have a corresponding .STM file that contain SMTP messages.