Files with the .EDB extension contain e-mail inbox databases created by the Microsoft Exchange Server.

The bases are saved in a b-tree structured format, and feature a main node as well as child nodes. EDB files allow for storing both processed and saved information outside of SMTP. The main files used by the server for this purpose are Priv1.Edb and Pub1.Edb, while all SMTP messages have their individual STM files.