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How To Fix IOUTLOOK.DLL is Missing / Not Found Error Messages

How To Fix IOUTLOOK.DLL is Missing / Not Found Error Messages?

TIOUTLOOK.DLL is a type of DLL file associated with Microsoft Windows Operating System developed by Microsoft Corporation for the Windows Operating System. The latest known version of IOUTLOOK.DLL is, which was produced for Windows. This DLL file carries a popularity rating of 1 stars and a security rating of "UNKNOWN".

DLL ("dynamic link library") files such as IOUTLOOK.DLL are small programs, similar to EXE ("executable") files, which allow multiple software programs to share the same functionality (eg. printing).


Common IOUTLOOK.DLL Error Messages

The most common IOUTLOOK.DLL errors that can appear on a Windows-based computer are:

  • "IOUTLOOK.DLL not found."
  • "The file IOUTLOOK.DLL is missing."
  • "IOUTLOOK.DLL Access Violation."
  • "Cannot register IOUTLOOK.DLL."
  • "Cannot find C:\Windows\System32\\IOUTLOOK.DLL."
  • "Cannot start Microsoft Windows Operating System. A required component is missing: IOUTLOOK.DLL. Please install Microsoft Windows Operating System again."
  • "This application failed to start because IOUTLOOK.DLL was not found. Re-installing the application may fix this problem."

These DLL error messages can appear during program installation, while a IOUTLOOK.DLL-related software program (eg. Microsoft Windows Operating System) is running, during Windows startup or shutdown, or even during the installation of the Windows operating system. Keeping track of when and where your IOUTLOOK.DLL error occurs is a critical piece of information in troubleshooting the problem.

Causes of IOUTLOOK.DLL Errors

Most IOUTLOOK.DLL errors are related to missing or corrupt IOUTLOOK.DLL files. Because IOUTLOOK.DLL is an external file, it presents a great opportunity for something undesirable to occur.

Improperly shutting down your PC or getting a virus infection could corrupt the IOUTLOOK.DLL, which could lead to DLL errors. When your IOUTLOOK.DLL file becomes corrupt, it cannot be loaded properly and will present an error message.

Other times, IOUTLOOK.DLL file errors could be related to issues in the Windows registry. Broken DLL file references can prevent your DLL file from registering properly, giving you a IOUTLOOK.DLL error. These broken registry keys can be as a result of a missing DLL file, moved DLL file, or an leftover DLL file reference in your Windows registry from an unsuccessful software installation or uninstallation.

More specifically, these IOUTLOOK.DLL errors can be caused by:

  • Invalid or corrupt IOUTLOOK.DLL registry entry.
  • Virus or malware infection which has corrupted the IOUTLOOK.DLL file.
  • Microsoft Corporation hardware failure, such as a bad hard drive, which has corrupted the IOUTLOOK.DLL file.
  • Another program overwrote the required version of IOUTLOOK.DLL.
  • Another program maliciously or mistakenly deleted the IOUTLOOK.DLL file.
  • Another program uninstalled the IOUTLOOK.DLL file.


When you install software that uses the IOUTLOOK.DLL dependency, the software should automatically register the file for you. In some cases your DLL file may not register properly, and as a result, will provide a "IOUTLOOK.DLL not registered" error. Fortunately, you can use a built-in utility called "Microsoft Register Server" (regsvr32.exe) to re-register your IOUTLOOK.DLL file.

How to re-register IOUTLOOK.DLL from an elevated command prompt (Windows XP, Vista, 7, 8, and 10):

  1. Click the Start button.
  2. Type "command" in the search box... DO NOT hit ENTER yet!
  3. While holding CTRL-Shift on your keyboard, hit ENTER.
  4. You will be prompted with a permission dialog box.
  5. Click Yes.
  6. Type the following command: regsvr32 /u IOUTLOOK.DLL.
  7. Hit ENTER. This will UN-REGISTER your file.
  8. Type the following command: regsvr32 /i IOUTLOOK.DLL.
  9. Hit ENTER. This will RE-REGISTER your file.
  10. Close the command prompt window.
  11. Re-start the program associated with IOUTLOOK.DLL error.

Sometimes IOUTLOOK.DLL and other DLL system errors can be related to problems in the Windows registry. Several programs can share the same IOUTLOOK.DLL file, but when these programs are uninstalled or changed, sometimes "orphaned" (invalid) DLL registry entries are left behind.

Basically, what this means is that while the actual file path may have changed, its incorrect former location is still recorded in the Windows registry. When Windows tries looking up these incorrect file references (file locations on your PC), IOUTLOOK.DLL errors can occur. In addition, malware infection may have corrupted the registry entries associated with Microsoft Windows Operating System. Thus, these invalid DLL registry entries need to be repaired to fix the root of the problem.

Manually editing the Windows registry to remove invalid IOUTLOOK.DLL keys is not recommended unless you are PC service professional. Incorrectly editing your registry can stop your PC from functioning and create irreversible damage to your operating system. In fact, one misplaced comma can prevent your PC from booting entirely!

Because of this risk, we highly recommend using a trusted registry cleaner such as  (Developed by Microsoft Gold Certified Partner) to scan and repair any IOUTLOOK.DLL-related registry problems. Using a registry cleaner automates the process of finding invalid registry entries, missing file references (like the one causing your IOUTLOOK.DLL error), and broken links within the registry. A backup is automatically created before each scan, with the ability to undo any changes in a single click, protecting you against the possibility of PC damage. The best part is that repairing registry errorscan also dramatically improve system speed and performance.



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