Outlook is a cornerstone for streamlining my work, I use it multiple times a day to communicate with clients. While that is extremely helpful, my reliance on Outlook means that when Outlook does not open or refuses to boot up, my productivity drops.
If you are someone who is unable to open Outlook or are met with a “Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. The operation failed.” error message, I have compiled a few effective solutions that you can use to fix your issue.
Why Won’t Microsoft Outlook Open?
If Microsoft Outlook won’t open, the root cause is almost always one of a handful of recurring issues. Understanding what is actually going wrong before you start troubleshooting will save you time and help you pick the right fix on the first try. The most common triggers include a corrupted Outlook profile, a damaged PST or OST data file, a conflicting COM add-in, an incomplete Office installation, or an outdated version of Windows or Outlook itself.
In some cases, Outlook appears to launch but gets stuck on the loading screen often accompanied by the message “Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened.” This specific error almost always points to a corrupted navigation pane configuration or a damaged default data file. On Windows 11 in particular, compatibility issues introduced after a major OS update can also prevent Outlook from starting normally.
Other times, clicking the Outlook icon produces no visible response at all. This is typically caused by a background Outlook process that did not close properly during the last session. Opening Task Manager and ending any lingering OUTLOOK.EXE processes before relaunching the application will often resolve this silently-failing scenario immediately.
Solutions For Microsoft Outlook won’t open Error
While there are several solutions, I recommend you try the following methods.
1. Repair Outlook
When there is an issue you must repair it, and what better way to fix Outlook than using the inbuilt office repair tool? Follow the instructions below to repair Outlook using the quick repair option.
1. Close Outlook and related applications.
2. Open Windows Settings.
3. Under Apps, click on Installed Apps.
4. Locate Outlook, click on the 3 dots, and select Modify.
5. Select the Quick Repair option and click on Repair.
2. Update the Operating Software
You must be running the latest version of your Windows OS for the best results. Follow the instructions below to update Windows.
1. Close all applications.
2. Open Windows Settings.
3. In the System Tab, click on Windows Update.
4. Click on Update Now, or Check For Updates.
3. Launch Outlook in Safe Mode
If that fails, try accessing the application by opening Outlook in Safe mode. Opening Outlook with safe mode by deactivating all the add-ins which more often than not can be conflicting and prevent Outlook from opening.
To open Outlook in Safe mode, follow the instructions below-
1. Use the Windows+R shortcut to open Run Command.
2. Enter Outlook.exe /safe and click on OK.
3.1. Update Outlook
We need to make sure that you have the latest Outlook version installed. To Updated Outlook without opening it, simply follow the instructions below-
1. Open Outlook in Safe mode.
2. Click on File and access the file menu.
3. Click on Office Account.
4. Click on Update Options and Select Update Now.
3.2. Disable Conflicting Add-ins
If you were successful in opening Outlook using Safe mode, there is a good chance that you have a lot of conflicting add-ins, and disabling them should resolve your issue. You can try out the following steps to disable conflicting add-ins.
1. Open Outlook in Safe mode.
2. Click on File and access the file menu.
3. Click on Options and access the Add-ins tab.
4. Select COM-add-ins and click on Go.
5. Uncheck all the Add-ins and click on OK.
4. Repair Outlook Data File
4.1 ScanPST
The inbox repair tool also known as ScanPST can be used to repair lightly corrupted or damaged PST. You can easily fix your Outlook won’t open error using scanPST, follow the instructions below.-
1. Locate ScanPST using the file pathways given below-
Outlook 2019
32-bit Version: C:\Program Files (x86)\Microsoft Office\root\Office19
64-bit Version: C:\Program Files\Microsoft Office\root\Office19
Outlook 2016
32-bit Windows: C:\Program Files (x86)\Microsoft Office\Office16\
64-bit Windows: C:\Program Files\Microsoft Office\Office16\
2. Open ScanPST and use the Browse… option to import your corrupted Outlook PST file and click on Start to begin the scan.
3. The tool will scan your PST file for errors, after which you can use the Browse… option to select a save location and name the repaired file. Then click on Repair to begin the repair process.
4. Verify the results.
4.2 Rikvr Repair For Outlook
ScanPST can only handle minor errors, you would need to use a professional PST repair tool to do what ScanPST can’t. Here we will be using Rikvr Repair for Outlook–
1. Download, Install, and launch Rikvr Repair for Outlook.
2. Import the Corrupted PST file.
Open Default PST File- Imports PST file from default location
Select PST File Manually- manually browse and select the corrupted PST file
Find All Your PST Files- The software scans the entire drive and lists out all the available PST files for you to choose from.
3. Choose a scanning method, select a save location, and click on Repair to begin the repair process.
4. Save the repaired PST file and verify the results.
How to Repair or Recreate Your Outlook Profile
A corrupted Outlook profile is one of the leading reasons Microsoft Outlook won’t open, yet it is one of the most frequently overlooked fixes. Your Outlook profile stores account settings, cached passwords, and folder configurations. When this profile becomes corrupted due to a sudden shutdown, a Windows update, or disk errors, Outlook can fail to load entirely or get stuck on the splash screen.
Create a New Outlook Profile
- Close Outlook completely. Open Task Manager and end any OUTLOOK.EXE processes if they are still running.
- Open the Control Panel and search for Mail (you may need to switch the view to Large Icons to see it).
- Click Mail, then select Show Profiles.
- Click Add, give your new profile a name (e.g., “Outlook New”), and follow the prompts to add your email account.
- Under When starting Microsoft Outlook, use this profile, select your new profile and click OK.
- Relaunch Outlook normally and verify that it opens successfully.
If Outlook opens correctly with the new profile, the old profile was the source of the problem. You can attempt to import items from your old data file into the new profile using File > Open & Export > Import/Export. If the old profile is too corrupted to import from directly, running ScanPST on the associated PST file (detailed in the section above) before importing is recommended.
Frequently Asked Questions: Microsoft Outlook Won’t Open
- Why is my Outlook email suddenly not working?
Outlook can suddenly stop working after a Windows or Office update, a corrupted data file, a faulty add-in, or a damaged user profile. Start by launching Outlook in Safe Mode (outlook.exe /safe) to isolate whether an add-in is the cause. If Outlook opens in Safe Mode, disable your COM add-ins one by one until the culprit is identified.
- Why won’t Outlook open when I click on the icon?
This usually means a previous Outlook session did not close properly and a background process is blocking a new instance from starting. Open Task Manager (Ctrl + Shift + Esc), look for any OUTLOOK.EXE process under the Processes tab, right-click it, and select End Task. Then try clicking the icon again.
- What does the error ‘Cannot start Microsoft Outlook, cannot open the Outlook window’ mean?
This error indicates that Outlook cannot load its default set of folders, which is almost always caused by a corrupted navigation pane settings file or a damaged PST/OST data file. Try running the Inbox Repair Tool (ScanPST.exe) on your data file, or create a new Outlook profile via the Control Panel’s Mail applet.
- How do I fix Microsoft Outlook won’t open on Windows 11?
On Windows 11, first ensure both Windows and Microsoft Office are fully updated. If the issue appeared after a Windows 11 update, try repairing Office via Settings > Apps > Installed Apps > Microsoft Office > Modify and run the Online Repair option for a more thorough fix than Quick Repair.
- How do I fix Microsoft Outlook won’t open on Windows 10?
The most effective sequence on Windows 10 is: (1) end any background Outlook processes in Task Manager, (2) launch in Safe Mode to rule out add-in conflicts, (3) run ScanPST.exe on your PST file, and (4) create a new Outlook profile if none of the above resolves the issue.
- Can a corrupted PST file stop Outlook from opening?
Yes. If your default PST file is severely corrupted, Outlook may refuse to open at all rather than simply showing an error inside the application. Run Microsoft’s built-in ScanPST.exe tool first; if the damage is too extensive for ScanPST to handle, a dedicated PST repair tool can recover and rebuild the file.
To Conclude
I hope that you can finally open Outlook and resume using it normally with the help of this article. Outlook can be tricky to deal with sometimes and approaching the right sources to deal with the issue can help. If you have any related queries or feedback, please reach out.
