An idx file extension is related to the Microsoft Outlook Express and used for its mailbox index files.

There are 6 other file types using
the IDX file extension!

empty icon.idx - Index file [common]

empty icon.idx - Easy Timesheets data

idx icon.idx - Sunnysoft InterWrite data

empty icon.idx - NoX game data

empty icon.idx - Hellgate: London game archive

empty icon.idx - Subtitle index file

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IDX file extension - Microsoft Outlook Express mailbox index

What is idx file? How to open idx files?

File type specification:

Various data file type icon Various data file type

idx file icon: idx filetype icon

The idx file extension is associated with Microsoft Outlook Express, an e-mail and news client included in earlier releases of Microsoft Internet Explorer.

The latest edition of Outlook Express is called Microsoft Mail Live.

The idx files are used for indexing of mail messages.

This idx file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

The default software associated to open idx file:

Microsoft Outlook Express icon

Microsoft Corporation logoMicrosoft Outlook Express  Microsoft Windows software

Company or developer:
Microsoft Corporation

Microsoft Outlook Express is an e-mail client distributed with Internet Explorer from version 4.0 to version 6.0. It is also pre-installed in several versions of Microsoft Windows, from Windows 98 to Windows XP.

Outlook Express is user-friendly and easy to use application, which supports standard POP, IMAP accounts, composing rich HTML e-mails, e-mail encryption, privacy protection, malware protection, e-mail sorting etc.

In Windows Vista is Outlook Express replaced with Windows Mail.

Help how to open:

Use Microsoft Outlook Express.

How to convert:

As far as we know, this .idx file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

List of software applications associated to the .idx file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open idx file, edit idx file, convert idx file, view idx file, play idx file etc. (if exist software for corresponding action in File-Extensions.org's database).

Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting idx files.

Programs that can create idx file - Microsoft Outlook Express mailbox index

Programs supporting the exension idx on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about Microsoft Outlook Express for create idx file action.

Microsoft Windows:

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