What is error custom UI XML Outlook+ [How to get rid of it]?

Last Updated on August 4, 2023 by Amit Bansal

An outlook error found in custom UI XML is a quite frequent problem. It happens when you are using the Outlook application.

And outlook error is caused by some corrupted files. Other reasons might be related to a corrupted registry.

Or, sometimes, outlook error is caused due to some virus attack. A corrupted registry can slow down your system and cause it to crash frequently.

These errors can be scary and annoying. However, most of them can be fixed easily.

What is Error Custom UI XML Outlook?

As users of Microsoft Outlook, we may encounter various types of errors while using the software.

One of these errors is the “Error loading custom UI XML” error. This error can be frustrating and can prevent us from using Outlook as we normally would.

In this section, we will explore what this error is and how it affects Outlook.

Error Custom UI XML

The “Error loading custom UI XML” error usually occurs when there is an issue with the customization of the Outlook interface.

Custom UI XML refers to the markup language used to customize the user interface of Outlook.

This customization can include adding or removing buttons, tabs, and other elements to make the interface more user-friendly and efficient.

Outlook

Outlook is a popular email client developed by Microsoft. It is used by millions of people around the world for personal and professional communication.

Outlook offers a range of features, including email, calendar, contacts, and task management.

The software also allows for customization of the user interface to suit individual preferences and needs.

When the “Error loading custom UI XML” error occurs in Outlook, it can prevent us from accessing certain features or using the software altogether.

This can be frustrating, especially if we rely on Outlook for our daily communication and task management.

To fix this error, we can follow some troubleshooting steps, such as disabling add-ins, creating a new Outlook profile, or resetting the ribbon customization.

It is important to note that the steps may vary depending on the version of Outlook we are using and the specific cause of the error.

In conclusion, the “Error loading custom UI XML” error is a common issue that can occur in Microsoft Outlook.

Understanding what this error is and how it affects Outlook can help us troubleshoot and resolve the issue quickly and efficiently.

Few Examples

Microsoft Outlook users’ graph in the bullish mode in corporate and personal use, due to several benefits. Sometimes, there can be some issues while working on Outlook. Recently I encountered Error 0x80004005.

This error code occurs when you click to generate a new mail. The error message may be displayed in the formats.

  • Error found in custom UI XMLoutlook error 0x80004005 Tab home group
  • Line 1
  • Column 159
  • Error code 0x80004005
  • Failed to find Office control by ID
  • ID: mso: TabHomegroup
  • Error found in custom UI XMLoutlook error 0x80004005
  • Line 1
  • Column 159
  • Error code 0x80004005
  • Failed to find Office control by ID
  • ID: mso: TabMail
  • Error found in custom UI XMLoutlook error 0x80004005 Tab send receive
  • Line 1
  • Column 159
  • Error code 0x80004005
  • Failed to find Office control by ID
  • ID: mso: TabSendReceive
  • Error found in custom UI XMLoutlook error 0x80004005 Tab notes
  • Line 1
  • Column 159
  • Error code 0x80004005
  • Failed to find Office control by ID
  • ID: mso: TabNotes
  • Error found in custom UI XMLoutlook error 0x80004005 Tab journals
  • Line 1
  • Column 159
  • Error code 0x80004005
  • Failed to find Office control by ID
  • ID: mso: TabJournals
  • Error found in custom UI XML
  • Line 1
  • Column 159
  • Error code 0x80004005
  • Failed to find Office control by ID
  • ID: mso: TabFolder
  • Error found in custom UI XMLoutlook error 0x80004005 group search options
  • Line 1
  • Column 159
  • Error code 0x80004005
  • Failed to find Office control by ID
  • ID: mso: GroupSearchOptions
  • Error found in custom UI XMLoutlook error 0x80004005 group search scope
  • Line 1
  • Column 159
  • Error code 0x80004005
  • Failed to find Office control by ID
  • ID: mso: GroupSearchScope
  • Error found in custom UI XMLoutlook error 0x80004005 group clear search
  • Line 1
  • Column 159
  • Error code 0x80004005
  • Failed to find Office control by ID
  • ID: mso: GroupClearSearch
  • Error found in custom UI XMLoutlook error 0x80004005 group mail refine search
  • Line 1
  • Column 159
  • Error code 0x80004005
  • Failed to find Office control by ID
  • ID: mso: GroupMailRefineSearch

Outlook error 0x80004005 appears due to the addin you installed in your outlook (it’s true I personally use kutools, Grammarly, etc), the day I install them I am getting an outlook invalid XML error message.

The error found in custom UI XML is almost similar, if you click OK you will get 9-11 similar popups, the only difference is ID: mso.

After clicking OK for all these messages Outlook works normally.

How do I fix error 0x80004005 Outlook?

You must disable all your “addin” available in Outlook and enable those you need until you will get back the error.

Another option is resetting your ribbon.

Here is the step-by-step guide:

  • Step 1 – Open Outlook
  • Step 2 – Click File >> Options >> customized ribbon
What is error custom UI XML Outlook
  • Finally, restart Outlook.

It works for me hope these steps also help you out and you will get rid of these issues.

Understanding Custom UI XML and Relationships

Custom UI XML is a markup language used by Microsoft Office applications to customize the user interface (UI).

It allows developers to create custom UI elements such as ribbon tabs, buttons, and menus.

Custom UI XML is defined in the ECMA-376 Office Open XML File Formats specification and is used by many Office applications, including Outlook.

Relationships are an important concept in Custom UI XML. They define the connections between different parts of the UI customization.

For example, a custom ribbon tab may have a relationship with a custom button group, and that button group may have relationships with individual buttons.

These relationships allow the Office application to load and display the custom UI elements in the correct order.

Relationships are defined in a separate file called a .rels file. This file contains a list of all the relationships between different parts of the UI customization.

Each relationship is defined by an ID, a type, and a target. The ID is a unique identifier for the relationship, the type specifies the type of relationship, and the target specifies the location of the related file.

Custom UI XML can be created using a text editor or an XML editor. The XML code must be saved in a separate file with a .xml extension.

The file must also be saved in a specific location within the Office application’s file structure. For example, in Outlook, the file must be saved in the %APPDATA%\Microsoft\Outlook folder.

Overall, Custom UI XML is a powerful tool for customizing the user interface of Microsoft Office applications.

By understanding the relationships between different parts of the UI customization, developers can create complex and sophisticated UI elements that enhance the user experience.

Checking the Version of Custom UI XML

When working with custom UI XML in Outlook, it is important to ensure that the version of the XML matches the version of Outlook being used.

This can help to prevent errors and compatibility issues. Here are a few ways to check the version of Custom UI XML:

  • Check the Namespace: One way to determine the version of Custom UI XML is to check the namespace used in the XML file. For example, the namespace for Office 2010 is “http://schemas.microsoft.com/office/2009/07/customui”, while the namespace for Office 2013 and later is “http://schemas.microsoft.com/office/2016/01/customui”. By checking the namespace in the XML file, you can determine the version of Office that the file is designed for.
  • Check the Ribbon ID: Another way to determine the version of Custom UI XML is to check the Ribbon ID used in the XML file. Each version of Office has a unique Ribbon ID, so by checking the ID in the XML file, you can determine the version of Office that the file is designed for.
  • Compare with Microsoft Documentation: Microsoft provides documentation on Custom UI XML for each version of Office. By comparing your XML file with the documentation for your version of Office, you can determine if the file is compatible with your version of Office.

By checking the version of Custom UI XML, you can ensure that your XML file is compatible with your version of Outlook and prevent errors from occurring.

Conclusion

Custom UI XML errors in Outlook can be frustrating and time-consuming to deal with.

However, with the right approach, they can be resolved relatively easily. By following the steps outlined in our article, you should be able to fix most custom UI XML errors in Outlook.

It is important to note that custom UI XML errors can sometimes be caused by issues outside of Outlook itself.

For example, problems with your computer’s registry or conflicts with other programs can sometimes cause these errors to occur.

If you are experiencing persistent custom UI XML errors in Outlook, it may be worth seeking the assistance of a professional IT support service to help diagnose and fix the underlying issue.

Overall, custom UI XML errors can be frustrating, but they are not insurmountable.

By following the steps outlined in this article and seeking professional help if necessary, you should be able to get your Outlook installation running smoothly once again.

Frequently Asked Questions

Here are some frequently asked questions about the error loading custom UI XML in Outlook:

What is custom UI XML?

Custom UI XML is a markup language used to customize the user interface of Microsoft Office applications, including Outlook.

It allows users to add, remove, or modify commands on the ribbon, context menus, and other parts of the interface.

What causes the error loading custom UI XML?

The error can occur when Outlook fails to load the custom UI XML file due to corruption, permission issues, or conflicts with other add-ins or programs.

It can also happen after an update or upgrade of Outlook or Windows.

How can I fix the error loading custom UI XML?

There are several solutions to try:

  • Disable or remove any add-ins that may be causing the conflict.
  • Reset the ribbon customization by clicking File > Options > Customize Ribbon > Reset.
  • Repair or reinstall Office or Outlook.
  • Create a new Outlook profile.
  • Check for Windows updates and install them.

Can I prevent the error from loading custom UI XML?

Yes, you can take some preventive measures:

  • Keep your Office and Windows up to date.
  • Use trusted and compatible add-ins.
  • Back up your custom UI XML file regularly.
  • Use caution when modifying the ribbon or other parts of the interface.

Who can help me with the error loading custom UI XML?

If you cannot fix the error on your own, you may seek help from Microsoft support, your IT department, or online forums and communities.

Be sure to provide as much information as possible about your system, the version of Outlook, and the steps you have taken to troubleshoot the issue.

Also Read:

Amit Bansal

Hello, my name is Amit Kumar Bansal, and I am the founder of MailSmartly.com. Through this blog, I focus on Microsoft Outlook, offering insightful and informative content. Additionally, I produce educational videos on YouTube to further enhance the understanding of my audience. visit my YouTube Channel

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4 thoughts on “What is error custom UI XML Outlook+ [How to get rid of it]?”

  1. you are an absolute star! I spent 40 min on the line with my company IT helpdesk who were stumped. I was going to have them rebuild my laptop…. after a bit of creative googling – I found this article and fixed my problem. I’ve sent a link to my IT dept so they have an answer for others in the future. Thank you and sending you all the good thoughts!

    Reply

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