Outlook may take a long time to open or seem stuck on the splash screen. This slowdown is often caused by add-ins that load during startup. Add-ins are extra programs that add features to Outlook, but some can conflict or have errors. This guide will show you how to find and disable problematic add-ins to restore normal startup speed.
Key Takeaways: Disabling Outlook Add-Ins
- File > Options > Add-ins > COM Add-ins > Go: Opens the main dialog to view and manage all installed add-ins in Outlook.
- Safe Mode (Outlook.exe /safe): Starts Outlook without any add-ins to confirm they are the cause of the startup delay.
- Disabled Items list: Stores add-ins you have turned off, allowing you to re-enable them individually later for testing.
Why Add-Ins Cause Outlook Startup Problems
Add-ins integrate deeply with Outlook to provide functions like meeting schedulers, CRM tools, or anti-virus scanning. When Outlook launches, it loads every active add-in listed in its registry. A faulty or outdated add-in can cause a timeout as Outlook waits for it to initialize. This results in the application hanging or taking minutes to open. Performance issues are most common after a Windows update or an upgrade to a new Outlook version, which can break add-in compatibility.
Steps to Disable Add-Ins in Outlook
The primary method is through the Outlook Options menu. Start by opening Outlook. If it is too slow to open normally, use the Safe Mode method described in the next section first.
- Open the Outlook Options window
Click the File tab in the top-left corner of the Outlook window. Then select Options from the left-hand menu. - Navigate to the Add-ins management pane
In the Outlook Options dialog, click the Add-ins category on the left. You will see a list of active and inactive add-ins at the bottom. - Open the COM Add-ins dialog
At the bottom, ensure Manage is set to COM Add-ins. Then click the Go button next to it. Do not click the Manage button for Microsoft Exchange or other types. - Disable suspected add-ins
In the COM Add-ins dialog, you will see a checklist of all installed add-ins. Uncheck the box next to any add-in you want to disable. It is best to disable all add-ins first, then restart Outlook to test. - Apply changes and restart
Click OK to close the COM Add-ins dialog. Click OK again to close the Outlook Options window. You must close and restart Outlook for the changes to take effect.
Using Safe Mode to Confirm the Issue
If Outlook will not open at all, start it in Safe Mode to bypass add-ins.
- Close Outlook completely
Use Task Manager to end any Outlook.exe processes. - Open the Run dialog
Press the Windows key + R on your keyboard. - Enter the Safe Mode command
Type outlook.exe /safe and press Enter. Outlook will start with a Safe Mode label in the title bar and all add-ins disabled. - Proceed to disable add-ins
If Outlook opens quickly in Safe Mode, follow the steps above within Safe Mode to manage your add-ins permanently.
If Disabling Add-Ins Does Not Solve the Problem
Outlook Still Slow After Disabling All Add-Ins
If startup remains slow with all add-ins disabled, the issue may be a corrupted Outlook profile or data file. Create a new Outlook profile via Windows Control Panel > Mail > Show Profiles > Add. Test if the new profile starts quickly. Also, run the Inbox Repair Tool (scanpst.exe) on your primary PST or OST file to fix data errors.
A Previously Disabled Add-In Keeps Re-enabling Itself
Some add-ins, especially from antivirus or enterprise management software, are forcefully re-enabled by their parent application. You may need to disable the add-in within the settings of that other program, or uninstall the software completely. Check for updates to the add-in software, as a newer version may resolve the conflict.
Outlook Crashes When You Click the Add-ins Menu
A crash when accessing File > Options > Add-ins indicates severe corruption in the add-in registry keys. Use the Microsoft Support and Recovery Assistant tool to diagnose and repair Outlook. Alternatively, you can use the command outlook.exe /resetnavpane to reset navigation pane customizations, which can sometimes resolve menu corruption.
Add-In Management Methods Compared
| Item | Disable via COM Add-ins Dialog | Start in Safe Mode |
|---|---|---|
| Primary Use | Permanently turn off problematic add-ins | Temporary test to confirm add-in cause |
| Outlook State Required | Outlook must be open and stable | Outlook can be failing to open normally |
| Change Persistence | Settings saved for future sessions | No settings changed; reverts on normal start |
| Access Path | File > Options > Add-ins > COM Add-ins > Go | Windows Run command: outlook.exe /safe |
After disabling add-ins, Outlook should start within its normal time frame. You can then re-enable add-ins one by one, restarting after each, to identify the specific culprit. For persistent performance issues, consider using the Outlook web app as a temporary workaround. An advanced tip is to use the Windows Event Viewer; check the Application logs for errors from the source Outlook or AddIn to get the exact name of a failing component.