“Folder set cannot be opened” in Outlook

“Cannot start Microsoft Outlook, Cannot open set of folders and The operation has failed”. Unfortunately, too many users are familiar with this error. Fix “The set of folders cannot be opened” in Outlook?

It usually appears out of nowhere when you start Outlook. In this guide, we will list a series of simple and easy-to-follow solutions to help you . He continues reading and discovers these simple solutions.

How to Fix “The Folder Set Cannot Be Opened” Error in Outlook

Important note: Back up your Outlook data before following the solutions below.

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Start Outlook in safe mode

Press the keys Windows and R to open a new run window. Then write Outlook.exe /safe and press Accept.

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If the problem disappears in safe mode, the plugins are most likely to blame. Go to the next step and deactivate your plugins.

Deactivate plugins

• 1. Start Outlook and go to Archive.
• 2. Select Options and click Accessories.
• 3. Click Manage and press the button Go.

• 4. Select the plugins you want to disable and save the changes.

Don’t forget to update your version of Outlook. Click Archiveselect Office Account, and go to Office update. Click Update Options and select Update now to update your email client.

Recreate your email profile

• 1. Some users were able to fix this error by recreating their email profiles.
• 2. Write regedit in the Windows search bar and launch the Registry Editor.
  Then navigate to Computer\HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Outlook\Profiles
• 3. Go ahead and delete all the folders listed under Profiles.

Note: Depending on your version of Office, you may need to navigate to Computer\HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\15.

• 4. Start Outlook and recreate your email profile.
• 5. Go to ArchiveChoose Account settings and click Manage profiles.

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• 6. Next, go to Show profiles and press the button Add.
• 7. Enter all the necessary details in the box Profile name and save the changes.

Alternatively, if you are not comfortable using the Registry Editoryou can just follow steps 5 to 8 to create a new profile.

If you can’t create a new profile using Outlook, go to control Panel → Mail → Show profiles → Add.

Office Repair

• 1. Go to control Panel and select Programs.
• 2. Click Programs and characteristics and select your Office package.
• 3. Press the button Change and launch the tool Quick Repair.
• 4. If the error persists and you still cannot use Outlook correctly, also run the online repair tool.

Repair Outlook

• 1. Go to Setting and select Applications.
• 2. Then click Apps and features and select Outlook (or Outlook integration on the desktop).
• 3. Go to Advanced Options and press the option Fix.

You can also repair Outlook data file (.pst) directly.

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• 1. Close Outlook and navigate to Outlook 2016/2019: C:\Program Files (x86)\NMicrosoft Office\root\NOffice16 or Outlook 2013: C:\Program Files (x86)\Microsoft Office\Office15 (depending on your version of Office).
• 2. Locate and run SCANPST.EXE

• 3. Click Examine to select Outlook data file (.pst).
• 4. Click the button Start and then select the option Fix.

Run Microsoft Support and Recovery Assistant

There is another very useful tool that you can use to repair Outlook. Microsoft Support and Recovery Assistant can quickly find and repair various Office and Outlook problems. Download the Microsoft tool, install it on your computer and that appear on the screen to repair Outlook.

Reduce Outlook data size

Large mailboxes can take a long time to open. Apart from that, they can also cause various errors during loading. Reduce the size of your mailbox and Outlook data files and check if the error persists.

• 1. Start Outlook, click ArchiveChoose Tools and click Mailbox Cleaning.

• 2. Select the items you want to delete and confirm your choice.
• 3. To reduce the size of the data file, empty the folder Deleted elements.
• 4. Then click Archiveand select Account settings.
• 5. Go to the tab Data Filesand select the file you want to compact.
• 6. Go to Setting and press the option Compact now.

Exchange users must click Setting → Advanced → File configuration Outlook data.

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Reinstall Outlook

If you use the standalone desktop app, uninstall it and restart your computer. Then download Outlook again (64 bit version). If the error persists, go to control Panel and select Uninstall a program. Then uninstall the Office package, restart your computer, and reinstall Office. Check the results.

Conclusion

Sometimes Microsoft Outlook may not start with the error “The set of folders cannot be opened”. To fix this, start Outlook in safe mode and disable your add-ins.

Next, repair Office and Outlook, create a new user profile, and reinstall the email client. Which of these solutions has worked for you? Let us know in the comments.

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