Wondershare Repairit
Email Repair

Perfectly repair and recover corrupted Outlook PST & OST files.

  • Fix all Outlook Email issues on Windows and Mac in various scenarios.
  • One trick to fix corrupted PST & OST files in Outlook.
  • Restore Outlook Emails deleted for a long time and extract important Email messages, folders, calendars, etc.
  • Perfectly compatible with Windows & Mac devices.
email repair

How to Fix the "Cannot Start Microsoft Outlook" Error?

When the "Cannot Start Microsoft Outlook" error comes your way, you might feel bothered like hell! An unexpected hike in the users' queries regarding the "Cannot Open Microsoft Outlook" error has been recently reported. Therefore, we felt it right to introduce you to this issue and how you can fix it.

Be with us till the end and we will assure you that you will be able to fix the problem yourself. Let us begin and learn the top methods and the reasons why you are unable to start your Outlook.

Part 1. The Causes And Symptoms of "Cannot Start Microsoft Office Outlook" Error

A symptom that can help you figure out the problem is simple. When you hit on the Outlook icon on your system, an hourglass shows and it freezes for some time. Right after this, you will get a Microsoft Outlook notice"Cannot start Microsoft Outlook. Cannot open the Outlook windows. The set of folders cannot be opened. The attempt to log on to Microsoft Exchange has failed."

the set of folders cannot be opened

  • One of the reasons could be the corrupted XML file in your Navigation settings. If you would like to go deeper, for this reason, make sure to check out the XML file size. If you see it as 0KB, it means it is the culprit why you cannot open Outlook.

  • You also get this error if you use your profile in the previous and old versions of Outlook. Also, if your Outlook is set in compatible mode, the problem is likely to occur.

  • Another thing that can probably raise the "Cannot Start Microsft Outlook" error is the deleted or damaged Outlook data file such as PST or OST file.
  • If any of the improper Outlook un-installations or re-installations processes happen, it can bring out the "Cannot Open Microsoft Outlook" error. Therefore, make sure to perform these functions correctly.

Now that you are aware of the reasons, the time has come to learn the solutions!

Part 2. 6 Fast Tips to Fix "Cannot Start Microsoft Outlook" Error

1 Turn off Compatibility Mode

As we have mentioned in the above section, your Outlook being in compatibility mode can turn out to be troublesome for you. Therefore, as the first tip, we will here learn how you can turn off the compatibility mode. This can be one of the excellent methods to solve a situation where you cannot open the Outlook window. Here is how you can do this!

Step 1: Hit on the Start button on your keyboard and type in "outlook.exe" in the search box.

turn off compatibility mode 1

Step 2: When you can see it, right-click on it and choose "Properties".

turn off compatibility mode 2

Step 3: The Properties dialog box will open where you have to click the "Compatibility" tab. Then, uncheck the option "Run this program in compatibility for". Hit "OK" for confirming the actions.

turn off compatibility mode 3

2 Start Outlook in Safe Mode

Another method that can turn out to be at your rescue is launching the application in Safe Mode. By doing this, we are starting Outlook sans any add-ins. This will simply indicate if the problem of Outlook cannot start Microsoft is being appeared due to any add-ins. This is what you need to do to fix cannot start Outlook issue using this method.

Step 1: On the Outlook icon in your PC, click on it and hold the Ctrl key. Alternatively, type "outlook /safe" in the search box and press the Enter key.

Step 2: Now, Outlook will prompt you to confirm if you wish to launch it in Safe Mode. Click "Yes" to proceed.

start outlook safe mode

3 Recover Navigation Pane configuration file

A yet another thing that brings you out from the trouble is to do some configuration with the Navigation pane as there might be some Navigation pane settings that have been corrupted and giving out the error. This is what you need to do.

Step 1: Simply open the Run dialog box on your system and type in "outlook.exe /resetnavpane".

Step 2: After typing, press the Enter key or click on "OK" and then launch Outlook. The settings will begin to recover now.

recover navigation pane

In case it did not recover, you can try to delete the Navigation pane settings. For this, here are the steps.

Step 1: On the Run dialog box, type "%appdata%\Microsoft\Outlook". This will bring the list of all configuration files stored in Microsoft Outlook.

Step 2: You need to now type "Outlook.xml file" in the search field.

delete navigation pane settings

Step 3: Once it is found, right-click on it and delete it. We hope that this will work for you. if now, moving on to the next fix will save you.

4 Repair your Outlook PST file using an Inbox Repair tool

If you still cannot start Outlook, it's time to look upon your Outlook PST files. These files, as already mentioned can give a hard time if there is any wrong thing happens during the uninstalling as well as re-installing the Outlook. Here is how you can repair it.

Step 1: Open Windows Explorer on your computer. To do this, you can press the Windows key along with the E key.

Step 2: Once it is opened, you need to navigate to the path – C:\Program Files\Microsoft Office\{Office version}.

In case you are having 64-bit Windows where 32-bit Office is installed, you need to follow this – C:\Program Files x86\Microsoft Office\{Office version}.

Step 3: As the next step, you need to look for the "Scanpst.exe". On finding it, double click on it to proceed. As an alternative way, you can hit on the Start button and in the search box, simply type "Scanpst.exe".

repair outlook pst 1

Step 4: After this, you are required to hit on the "Browse" button to choose the default Outlook.pst file.

Step 5: Click on the "Start" button now so that the scanning of the file will begin. On having the errors in the PST file, a message will be shown in the dialog box of the Microsoft Outlook Inbox Repair tool. The message will be, "Errors were found in this file. To repair these errors, click Repair."

repair outlook pst 2

Step 6: You can now click on the "Repair" and then this will begin the repairing process. When it gets completed, you can start the Outlook application with a PST file. Check if the problem persists. If unfortunately yes, jump to the next tip.

5 Create a new Outlook profile and import data from the old PST file

Once you have tried and test all of the above methods and nothing is changed, you need to try to create a fresh profile for Outlook and set it up with the email account. Only this will solve your problem as the last resort. This is what you need to do.

Step 1: Start with heading to the Control Panel and choosing "Mail" > "Data Files" > "Add" and make the profile.

create new profile 1

Step 2: Once this is done, make sure to keep the new profile as the default one. For this, simply hit on "Account Settings" followed by "Data Files". Choose your profile and click on "Set as Default".

create new profile 2

Step 3: Now, open Outlook and see if cannot start Outlook error goes and it works properly. If yes, you can now import the data from the previous Outlook PST file. For this, head to the "File" option and click on "Open" > "Import". Choose "Import from another program or file" followed by "Next".

import data from old pst 1

Step 4: Now, select "Outlook Data File (.pst)" and move to the "Next". Hit on "Browse" and get your old .pst file selected. Hit on "Next" followed by "Finish".

import data from old pst 2

6 Reduce Outlook Data File Size

The Outlook errors like "cannot start microsoft outlook. cannot open the outlook window. the set of folders cannot be opened" may also be caused by large-sized Outlook data files. In this case, you can reduce the size of your data file to solve this problem.

Way 1: Manually split Outlook data files or use third party PST splitter tool.

Way 2: Empty deleted items folder and remove unimportant emails and other mailbox items.

Way 3: Archive old emails in a new Outlook data file.

Way 4: Manually compress data files.

Part 3. What To Do When All The Above Methods Fail To Fix Outlook Error?hot

Upon trying all of the above methods, if you still cannot open Outlook, check out this section. We would like to introduce you Wondershare Repairit for Email, which is designed to repair the Microsoft Outlook in a hassle-free way. Through Wondershare Repairit for Email, you are able to remove the warning note"The set of folders cannot be opened" and successfully log on to Microsoft Exchange immediately. As an alternative, this tool serves your purpose in the best possible way.

Wondershare Repairit for Email

1,010,994 people have downloaded it.

  • Repair damaged PST/OST Files in Outlook in all Email corruption scenarios, such as hard disk crashes & bad sectors, virus attacks & tojan horse, outlook corruption & malfunctions, improper shutdown procedure, etc.

  • Restore Outlook Emails deleted for a long time with a very high success rate.

  • Repair emails in bathes without size limits and support to preview all of them before saving.

  • Compatible with Windows 7/8/8.1/10/11, Windows Server 2012/2016/2019, and MacOS X 10.11~ MacOS 12 (Monterey).

Download Wondershare Repairit for Email and then follow the below steps to repair your corrupted PST files:

Step 1: Add your corrupted Outlook PST files.

Lunch and run Wondershare Repairit for Email, then click "Select File" to upload the corrupted PST files.

add pst file

Selecting files from the desired location after clicking the "Find" button, then click the "Repair" button. You can add a single or batch of emails.

start repair

Step 2: Repair the uploaded PST files.

Repairit for Email will automatically repair your corrupt PST files in seconds. Just wait for a few seconds.

repair pst file

Step 3: Preview and save the fixed Outlook PST files.

After the repair process finishes, Repairit lets you preview the restored Outlook mailbox data. Select what you want to save, hit the "Save" button to save the fixed PST files on your computer.

preview save

The Bottom Line

Being one of the useful email programs, we don't expect such problems to come over and act as hurdles in our further processes. However, where there is a problem, there exists a solution. And in this article, there existed 6 solutions.

Among those, we still recommend you Wondershare Repairit for Email for its better performance and efficiency. We are now closing the topic here and hope that this post worked well for you. If yes, don't forget to share your views with us in the comments section below. Also, share this article with the ones who need help with the same issue.