How to Fix ‘Outlook Library Not Registered’ Error

Stuck with the "Outlook Library Not Registered" error? Learn simple steps to fix it and access your emails smoothly again.

The “Outlook Library Not Registered” mistake usually happens when there are problems with the parts or dependencies of the Microsoft Outlook application. This error message means that the necessary libraries for Outlook are not properly listed in the system. In this article we will show you how to Fix ‘Outlook Library Not Registered’ Error.

There are a number of steps that people can take to fix this problem. This could mean fixing the Microsoft Office software, re-registering the Outlook libraries using the Command Prompt, or using the Microsoft Office Configuration Analyzer Tool (OffCAT) to find and fix possible issues.

Also, making sure that the Outlook app is running the most recent version and looking for updates can be very helpful in fixing compatibility problems. By quickly fixing the “Outlook Library Not Registered” problem, users can get their Outlook programme back to normal, which will allow them to send and receive emails and use the program’s features effectively. Go to the Outlook official site if you want to learn more about how to fix this problem.

What is Outlook library not registered error?

  • Having trouble with the registry? The computer’s registry has a key for an older version of the Outlook View Control. There may not be a version that has been changed being used.
  • The older version – The leftovers of an old Microsoft Office version can sometimes make things not work right.

What are the causes of Outlook Library Not Registered Error

  • Not present or broken registry key: This error usually means that a registry key related to Outlook libraries is not present or broken. This can happen because of software conflicts, virus scans, or even deleting something by mistake.
  • Incorrect file registration: The DLL files that Outlook needs to work properly aren’t always registered correctly in the Windows system. This can happen during system changes or installation problems.
  • Damaged Outlook installation: This problem can also be caused by files that are damaged in the Outlook installation.
How to Fix 'Outlook Library Not Registered' Error
  • Software that doesn’t work well together: Other programmes that mess up Outlook or its files can make it hard to register.
  • Third-party add-ins: Outlook can sometimes have problems because of add-ins that don’t work right, which can cause the mistake.

Fixed: Outlook Library Not Registered Error

Re-register Outlook Libraries

  1. Press and hold Windows + X, then pick “PowerShell (Admin)” or “Command Prompt (Admin).”
  2. Press Enter after typing cd C:\Program Files (x86)\Microsoft Office\root\Office16. Note: Change the path based on the version of Office you have and where it was installed.
  3. One at a time, type the following instructions and press Enter after each one:
  4. Shut down the Command Prompt and start up Microsoft Outlook again.

Check Outlook Options

  1. Open Outlook and go to File > Options.
  2. Now click on Advanced.
  3. Make sure that Start Outlook in this folderInbox is chosen.
  4. After clicking OK, open Outlook again and look.

Disable the Script Error Notification

  1. Search is fighting Open Internet Options
  2. Go to the tab that says “Advanced.”
  3. In the list, find the part called “Browsing.” Click on “Disable script debugging” (Other).
  4. Hit “Apply” or “OK” to leave.

Repair Outlook

  1. To get to Settings, press the Windows Key + I.
  2. To get to Apps & Features, click on Apps.
  3. Now, find the office product you want to fix, scroll down, click on it, and choose Repair.
  4. Click Online Repair and then do what it says on the screen.


Why is my Outlook class not registered?

DLL files that are missing or damaged: The “Class Not Registered” problem can happen if important DLL files are missing or damaged. Problems with the registry: This error can also be caused by invalid or broken registry records for the class or component.

How do I fix a class not registered error?

If you get a “Class Not Registered” error in Windows, you can fix it by closing and reopening File Explorer, re-registering all your DLL files, resetting Windows’ default apps, re-registering your Microsoft Store apps, running SFC, fixing or reinstalling Microsoft Visual C++ Redistributable packages, or going back to a previous point in time.

What does invalid class error mean?

It’s possible that the Windows Management Instrument (WMI) service hasn’t been started or is broken, which would cause this problem. Select “Services” from the Windows Start menu, then open the “Services” app, and check to see if the “Windows Management Instrument” service is running.

Editorial Staff
Editorial Staff
The Bollyinside editorial staff is made up of tech experts with more than 10 years of experience Led by Sumit Chauhan. We started in 2014 and now Bollyinside is a leading tech resource, offering everything from product reviews and tech guides to marketing tips. Think of us as your go-to tech encyclopedia!


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