.IDX File Description

Stores an index of mail messages stored in an Outlook Express mailbox (.MBX file); should be located in the same folder as the mailbox files; required for importing old Outlook Express mailboxes into Outlook Express 5 or later.

Other Information For .IDX File Extension

• Company:

  Microsoft Corporation.

• File Type:

  Outlook Express Mailbox Index File

• Identifying Characters (Hex):

  N/A

• Identifying Characters (ASCII):

  N/A