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Fix: This is Not a Valid File Name Error in Outlook

You can try disabling the add-ins or repair MS Office

6 min. read

Updated onOctober 4, 2023

updated onOctober 4, 2023

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Key notes

Microsoft Outlook is used by professionalsand businesses, thanks to the ease of use it offers. However, users have been facing theThis is not a valid file nameerror in Outlook when sending emails lately. A similarthis is not a valid file name erroris experienced when using OneDrive, which you can resolve by checking out our guide.

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 experiencingThis is not a valid file nameerror 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 ofThis is not a valid file nameerror in Outlook, the complete error message reads:

This is not a valid file name.Try one or more of the following:*Check the path to make sure it was typed correctly.*Select a file from the list of files and folders.

Here are a few reasons that could trigger theThis is not a valid file nameerror in Outlook:

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:

1. Disable Add-ins in Outlook

Some add-ins might be interfering with the functionality of Microsoft Outlook thereby causing theThis is not a valid file nameerror 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.

This solution might also be helpful in cases whereOutlook could not create the work file.

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.

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 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 onhow to use Outlook Scheduling Assistanton your PC, which could be helpful in many use-case scenarios.

If you are looking for a guide on how you canuse multiple accounts in MS Outlook, then check out our dedicated guide.

Microsoft Outlook also comes with anautomated replay featurethat would reply on your behalf to emails that come into your inbox. If you are experiencingOutlook keeps asking for a passwordissue, 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 theThis is not a valid file nameerror in Outlook.

Fix: This is Not a Valid File Name Error in Outlook#

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

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

1. Disable Add-ins in Outlook#

2. Create a new Outlook profile#

3. Modify Outlook with Registry Editor#

4. Use Microsoft Support and Recovery Assistant#

5. Repair Microsoft Office#