| Primary Cause | Recommended Solution |
|---|---|
| Hardware Acceleration | Disable via Registry or Outlook Settings |
| Outdated Display Drivers | Update GPU drivers via Device Manager |
| Incompatible Add-ins | Launch in Safe Mode and disable extensions |
| Corrupt Office Installation | Perform an Online Repair of Microsoft 365 |
What is Outlook Screen Flickering?
Outlook screen flickering is a visual glitch where the application window flashes, stutters, or blacks out momentarily during use. This behavior usually occurs when navigating folders, composing emails, or scrolling through the inbox.
This issue is rarely a hardware failure of your monitor. Instead, it is typically caused by a conflict between the Outlook rendering engine and your computer’s graphics processing unit (GPU). It is most common in Microsoft 365 and Outlook 2019/2016 environments.
The root cause is often “Hardware Graphics Acceleration,” a feature intended to improve performance that sometimes clashes with specific high-refresh-rate monitors or dual-monitor setups.
Step-by-Step Solutions
1. Disable Hardware Graphics Acceleration
In newer versions of Outlook, the option to disable hardware acceleration via the UI may be missing. You can force this change through the Windows Registry.
Press Win + R, type regedit, and navigate to: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Graphics.
Create a new DWORD (32-bit) Value named DisableHardwareAcceleration and set its value to 1.
2. Launch Outlook in Safe Mode
If flickering stops in Safe Mode, a third-party add-in is likely the culprit. You can test this using the following command:
outlook.exe /safeNavigate to File > Options > Add-ins. Select COM Add-ins and click Go. Uncheck all items and restart Outlook normally.
3. Update Your Graphics Drivers
Incompatibility with your GPU driver is a frequent cause of display artifacts. Open the Device Manager and expand Display adapters.
Right-click your active GPU (Intel, NVIDIA, or AMD) and select Update driver. Choose “Search automatically for drivers” or download the latest version directly from the manufacturer’s website.
4. Repair Microsoft Office
If the application files are corrupted, a repair can fix the flickering. Close all Office apps and go to Settings > Apps > Installed Apps.
Find Microsoft 365/Office, click the three dots, and select Modify. Choose Online Repair to ensure a comprehensive fix of all system files.
5. Change Monitor Refresh Rate
Sometimes Outlook struggles with high refresh rates (120Hz+). Go to Settings > System > Display > Advanced display.
Lower your refresh rate to 60Hz temporarily to see if the flickering persists. If it stops, you may need to update your docking station firmware or monitor drivers.