What is IDX? What Opens a IDX? File Format List from WhatIs.com

File Extension

IDX File Format

Microsoft Outlook Express file

IDX-1 file format

IDX is an indexing file used by Microsoft Outlook Express. Files are stored emails from an Outlook mailbox. The files are needed when importing old messages to Outlook Express version 5 or higher.

MIME: application/x-latex

Learn more about .IDX files:

Search for answers to .IDX-related questions on IT Knowledge Exchange.

This was last updated in July 2010
Editorial Director Margaret Rouse

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