How To Resolve MS Outlook Error Code 400?

Outlook is the well known application of MS Office which is basically used to send and receive emails. And the user can use this application by installing MS Office software in their device through This application is very simple and easy to use but sometimes the user faces some issues like Outlook error code 400.  This error occurs when there is an unexpected fault in the connector when the user is trying to send a message but the message was not sent and also if the message which you are sending has unusual formatting or content which stops the message from being forwarded. If you want to fix this issue, then you must check the content which you are sharing. In this blog, you will read the solution of the Outlook Error Code 400.

Symptoms of the Outlook Error Code 400:

The symptoms of the Outlook Error Code 400 are it crashes the active program window, if your computer system frequently crashes with Error 400 when you run the same program, on your system if it displays Outlook Error 400, if your Windows runs sluggishly and it responds very slowly to your mouse or keyboard and if your PC periodically “freezes” for few seconds.

Basically, this error occurs during program installation, when Microsoft Outlook is running, and also during Windows startup or shutdown or even during the installation of the Windows OS. Hence, it is highly recommended that you should keep your computer system updated.

Solution to Troubleshoot Outlook Error Code 400:

  1. Restore System to Previous Version:

For this, you should click on the Start button and in the search box, you have to type “System Restore” and then tap on Enter key. Now in the results, you have to click on System Restore. After this, you need to enter any administrator passwords if it asks. Then, you should follow the steps in the Wizard just to select a restore point. At last, you have to restore your computer system.

  • Run System File Checker:

First, click on the Start option. Then, you need to type “command” in the search box and remember do not press on Enter key. And after this, press and hold Ctrl +Shift key on your keyboard and then tap on Enter key. Now, the permission dialog box opens up on your screen and you have to click on Yes option. Then, the black box will open up on your screen with a blinking cursor. Here, you just have to write “SFC /SCANNOW” and tap on Enter key. At this point, System File Checker will start scanning for the Error 400 and other system file issues. This scanning process will take some time so you have to wait for few minutes. At last, you should follow the on screen commands to complete the process.

The above procedure will help the user to fix Outlook Error Code 400. If the user cannot be able to solve the error then they can call the experts of Outlook team. If in case, you need help then just go to the site of Microsoft through You can call the experts 24/7 as they are available all the time.

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