How to fix Outlook error 17099

Error 17099, known as Outlook Express Error Code 17099, happens when Microsoft Outlook Express fails or crashes when it is running. Most of the time when this error appears, the code isn’t corrupt, it just means that it didn’t work during its run-time. This error will appear as a notification on your screen until it is correctly dealt with. The error message can come up the screen anytime Microsoft Outlook is run. In addition to this, the error message, as well as other dialogue boxes can come up repeatedly if not addressed at an early stage.

Some users have also reported instances of file deletion or new files appearing. Although this usually happens due to a virus infection on the computer, it may also be classed as a symptom for runtime error. This is because virus infections are just one of the causes for runtime errors. Another symptom that users may also experience is a sudden drop in internet connection speed. This blog post will cover how you can fix Outlook error 17099 in three simple steps: closing conflicting programs, reinstalling conflicting programs and finally, updating your antivirus program. 

Step 1: Closing conflicting programs to fix Outlook error 17099:

  1. Press Ctrl – Alt – Del at the same time and select task manager. Then go to the processes tab
  2. Click on the program that you think may be causing Outlook to crash.
  3. Then click ‘End task’

Ensure that you keep checking if the error message stops showing up after each program you close. This will show you which program conflicts with Outlook. Once you have found the program, continue to step 2.

Step 2: Reinstalling the conflicting program to fix Outlook error 17099:

  1. In the windows search box, type ‘Control panel’
  2. Open up Control panel
  3. Under ‘Programs’ click on ‘Uninstall a program’
  4. Select the program that was causing the conflict and click ‘Uninstall’. Then, reinstall the program

Step 3: Updating your antivirus program to fix Outlook error 17099

Viruses on your computer can cause runtime errors and have to be deleted immediately. It is vital to ensure your virus protection program is up to date. Then, run a scan of your computer to ensure there is no virus or threat.

Causes of Outlook error 17099

Although program developers code programs while anticipating the occurrence of errors, glitches can happen during runtime if a certain error is not experienced and addressed during design and testing. Runtime errors are often caused by incompatible programs running at the same time. Another cause for the error may be memory problems, a poor graphics driver or even a virus infection. When this error occurs, the cause should be found and the problem must be resolved immediately to avoid further issues. Below is a step by step guide on how to fix this error.

Step by step process to close conflicting programs and fix Outlook error 17099

  1. Press Ctrl – Alt – Del at the same time and select task manager. Then go to the processes tab

On the keyboard, press down Ctrl – Alt – Del at the same time. This will bring up options on the screen including shut down, restart, sleep etc. From the bottom of the list, select task manager/ when the task manager window appears, click on the tab for ‘Processes’ from the panel at the top of the window.

  1. Click on the program that you think may be causing Outlook to crash.

As an example for this blog post, I have selected Microsoft Edge. you may select any program that you think may be the cause, as you will be going through each program one by one until you find the problematic program. 

  1. Then click ‘End task’

Once you have selected the program, click on ‘End task’ at the bottom of the window. Ensure that you keep checking if the error message stops showing up after each program you close. This will show you which program conflicts with Outlook. Once you have found the program, continue to step 2.

Step by step process to reinstall the conflicting programs and fix Outlook error 17099

  1. In the windows search box, type ‘Control panel’

At the bottom of your screen in your search box, type in ‘Control panel’.

  1. Open up Control panel

Once the option for control panel shows up, click on it to open

  1. Under ‘Programs’ click on ‘Uninstall a program’

When the Control manager window opens, click on ‘Uninstall a program’ under the ‘Programs’ section.

  1. Select the program that was causing the conflict and click ‘Uninstall’. Then, reinstall the program

From the list of programs on your computer, click on the one that was causing the issue from step 1, then click on ‘Uninstall’. Now you can reinstall the program. 

Update your antivirus program to fix Outlook error 17099

Viruses on your computer can cause runtime errors and have to be deleted immediately. It is vital to ensure your virus protection program is up to date. Then, run a scan of your computer to ensure there is no virus or threat.

Once you have completed all three of these steps, error 17099 should now be fixed.

Thank you for reading! If you have any further questions, feel free to leave a comment below and we’ll be happy to help.

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Siddra Afzal

Siddra Afzal has been a researcher and content writer at Business Tech Planet since 2021. Siddra formerly wrote newsletters for the NHS and was a PR and Communications Officer. She now combines her passion for photography and video editing with her knowledge of communications, writing, and research to the art of crafting the perfect tech guides for BTP. You can connect with Siddra on LinkedIn.

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