How to Download, Fix, and Update Mail_index.dat

Last Updated: 11/28/2023
[Time to Read: ~3-5 minutes]

mail_index.dat, also known as a Game Data file, was created by eM Client for the development of eM Client 7.2.35595. DAT files fall under under the Dynamic Link Library (Game Data) file type category.

The first version of mail_index.dat was released for the Windows 10 Operating System on 05/16/2019 inside eM Client 7.2.35595. This is not only most recent release from eM Client, but it's the only version known in existence.

Continue reading below to discover detailed file information, DAT file troubleshooting, and free downloads of several versions of mail_index.dat.

File Analysis Provided by Jason Geater (Author)


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File Overview


General Information
File Name: mail_index.dat
File Extension: DAT file extension
File Type: Dynamic Link Library
Description: Game Data
User Popularity Rating:
 
Developer and Software Information
Software Program: eM Client 7.2.35595
Developer: eM Client
Software: eM Client
Software Version: 7.2.35595
File Details
File Size (Bytes): 4096
Oldest File Date: 01/01/2020
Latest File Date: 01/01/2020


What are mail_index.dat Error Messages?


Dynamic Link Library mail_index.dat Errors

mail_index.dat is considered a type of Dynamic Link Library (DLL) file. Dynamic Link Library files, like mail_index.dat, are essentially a "guide book" that stores information and instructions for executable (EXE) files - like MpSigStub.exe - to follow. These files were created so that multiple programs (eg. eM Client) could share the same mail_index.dat file, saving valuable memory allocation, therefore making your computer run more efficiently.

Unfortunately, what makes DLL files so convenient and efficient, also makes them extremely vulnerable to problems. If something happens to a shared DAT file, either it goes missing or gets corrupted in some way, it can generate a "runtime" error message. Runtime is pretty self-explanatory; it means that these errors are triggered when mail_index.dat is attempted to be loaded either when eM Client is starting up, or in some cases already running. Some of the most common mail_index.dat errors include:

Your mail_index.dat file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with eM Client), or deleted by a malware infection. Furthermore, mail_index.dat file corruption could be caused from a power outage when loading eM Client, system crash while loading mail_index.dat, bad sectors on your storage media (usually your primary hard drive), or quite commonly, a malware infection. Thus, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.



How to Fix mail_index.dat Errors in 3 Steps (Time to complete: ~5-15 minutes)

If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your mail_index.dat issue. These troubleshooting steps are listed in the recommended order of execution.


Step 1: Restore your PC back to the latest restore point, "snapshot", or backup image before error occurred.

To begin System Restore (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. When you see the search box, type "System Restore" and press "ENTER".
  3. In the search results, find and click System Restore.
  4. Please enter the administrator password (if applicable / prompted).
  5. Follow the steps in the System Restore Wizard to choose a relevant restore point.
  6. Restore your computer to that backup image.

If the Step 1 fails to resolve the mail_index.dat error, please proceed to the Step 2 below.

Step 2: If recently installed eM Client (or related software), uninstall then try reinstalling eM Client software.

You can uninstall eM Client software by following these instructions (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. In the search box, type "Uninstall" and press "ENTER".
  3. In the search results, find and click "Add or Remove Programs"
  4. Find the entry for eM Client 7.2.35595 and click "Uninstall"
  5. Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall eM Client software.

If this Step 2 fails as well, please proceed to the Step 3 below.

eM Client 7.2.35595

eM Client

Step 3: Perform a Windows Update.

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many mail_index.dat error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

  1. Hit the Windows Start button
  2. In the search box, type "Update" and press "ENTER".
  3. In the Windows Update dialog box, click "Check for Updates" (or similar button depending on your Windows version)
  4. If updates are available for download, click "Install Updates".
  5. After the update is completed, restart your PC.

If Windows Update failed to resolve the mail_index.dat error message, please proceed to next step. Please note that this final step is recommended for advanced PC users only.



If Those Steps Fail: Download and Replace Your mail_index.dat File (Caution: Advanced)

If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate mail_index.dat file version. We maintain a comprehensive database of 100% malware-free mail_index.dat files for every applicable version of eM Client. Please follow the steps below to download and properly replace you file:

  1. Locate your Windows operating system version in the list of below "Download mail_index.dat Files".
  2. Click the appropriate "Download Now" button and download your Windows file version.
  3. Copy this file to the appropriate eM Client folder location:
    Windows 10: C:\Users\Tester\AppData\Roaming\eM Client\Archive\
    Windows 10: C:\Users\Tester\AppData\Roaming\eM Client\Local Folders\
    Windows 10: C:\Users\Tester\AppData\Roaming\eM Client\Search Folders\
  4. Restart your computer.

If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows 10.


GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve mail_index.dat problems. To avoid data loss, you must be sure that you have backed-up all of your important documents, pictures, software installers, and other personal data before beginning the process. If you are not currently backing up your data, you need to do so immediately.



Download mail_index.dat Files (Malware-Tested 100% Clean)


CAUTION : We strongly advise against downloading and copying mail_index.dat to your appropriate Windows system directory. eM Client typically does not release eM Client DAT files for download because they are bundled together inside of a software installer. The installer's task is to ensure that all correct verifications have been made before installing and placing mail_index.dat and all other DAT files for eM Client. An incorrectly installed DAT file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

Windows 10


Files Related to mail_index.dat


DAT Files Related to mail_index.dat

File Name Description Software Program (Version) File Size (bytes) File Location
FontCache-S-1-5-18.dat Game Data eM Client 7.2.35595 8388608 C:\Windows\System32\WDI\{86432a0b-3c7d-4ddf-a89...
ntuser.dat Game Data eM Client 7.2.35595 262144 C:\Windows\inf\
9NBLGGH4NNS1.dat Game Data eM Client 7.2.35595 471 C:\Windows\Temp\A2338313-ACF6-4CB5-9131-105D3A1...
folders.dat Game Data eM Client 7.2.35595 4096 C:\Windows\Prefetch\
settings.dat Game Data eM Client 7.2.35595 262144 C:\Windows\System32\

Other Files Related to mail_index.dat

File Name Description Software Program (Version) File Size (bytes) File Location
setupact.log Log eM Client 7.2.35595 62521 C:\Windows\Panther\UnattendGC\
setupapi.dev.log Log eM Client 7.2.35595 684126 C:\Windows\inf\
api-ms-win-core-sysinf... ApiSet Stub DLL Microsoft® Windows® Operating System (10.0.17134.12) 12136 C:\Users\Tester\AppData\Local\Microsoft\OneDriv...
EtwRTEventLog-System.etl Microsoft Event Trace Log eM Client 7.2.35595 5208 C:\Windows\System32\LogFiles\WMI\RtBackup\
api-ms-win-core-consol... ApiSet Stub DLL Microsoft® Windows® Operating System (10.0.17134.12) 11624 C:\Users\Tester\AppData\Local\Microsoft\OneDriv...


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