Notably, this error could also appear when you are trying to save a file or even forward/reply to an email. If you are also experiencing This is not a valid file name error in Outlook and are looking for solutions then you are in the right place.

Why am I getting the This is not a valid file name error in Outlook?

Speaking of This is not a valid file name error in Outlook, the complete error message reads: Here are a few reasons that could trigger the This is not a valid file name error in Outlook:

A temporary glitch in Outlook: Certain errors can also be a result of a temporary and small glitch. Presence of special characters in the email: If you have special characters used in the email, then you will face this error. Hidden or broken links: If there are hidden or broken links in the email, then also you will come across This is not a valid file name error in Outlook. Add-ins are conflicting with Outlook: Add-ins apart from expanding the features of a program can also interfere with its smooth performance of it. Issues with the PST file: If there is something wrong with the path of the PST file, then also you will face this error.

Let us take a look at how you can resolve the problem on your end.

How can I fix This is not a valid file name error in MS Outlook?

Here are a few things that we would suggest you apply before moving ahead with the advanced troubleshooting methods:

Restart your PC as this error could pop up because of a temporary glitch or maybe the program failed to load all files properly. Remove any special characters in the email and make sure that there are only letters and numbers used in the email. Also, remove any hidden or broken links in the email as this could also trigger the This is not a valid file name error in Outlook.

1. Disable Add-ins in Outlook

Some add-ins might be interfering with the functionality of Microsoft Outlook thereby causing the This is not a valid file name error in Outlook. Simply load Outlook in Safe Mode and disable all add-ins. Relaunch the program and check if this fixes the issue or not.

2. Create a new Outlook profile

There are chances that your Outlook profile might be corrupted and is showing the error because of it. The easy way to resolve this is to delete the existing profile and add the profile back again and check if this fixes the issue or not. SPONSORED

3. Modify Outlook with Registry Editor

For some users, this issue was resolved when they changed the Value Data to the above-mentioned command. They found out that the Value Field for MS Outlook was empty or changed, which was causing the issue.

4. Use Microsoft Support and Recovery Assistant

Microsoft has a troubleshooting tool that will help you to resolve errors associated with Microsoft Office programs. All you need to do is install it on your PC, and follow the steps mentioned above to resolve the error.

5. Repair Microsoft Office

You can opt for the repair process before going ahead with reinstalling the Microsoft Office program. This has helped users fix the problem and avoid the hassle of reinstalling the program back again. We have a guide on how to use Outlook Scheduling Assistant on your PC, which could be helpful in many use-case scenarios. If you are looking for a guide on how you can use multiple accounts in MS Outlook, then check out our dedicated guide. Microsoft Outlook also comes with an automated replay feature that would reply on your behalf to emails that come into your inbox. If you are experiencing Outlook keeps asking for a password issue, we suggest you check out the guide and resolve the problem. Let us know in the comments below, which one of the above solutions helped you resolve the This is not a valid file name error in Outlook.

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