How to Troubleshoot “The set of folders cannot be opened” Issue on Outlook

  • The most common error encountered is “Cannot open folder group” error.
  • This error is often an obstacle for users when they want to access their Outlook messages and emails.
  • The main reason is a corrupt Outlook profile file – the.xml file named Outlook.xml.
  • Another reason could be that Outlook is trying to work in compatibility mode or that you are using a profile file created in an older version of Outlook that has been deleted or corrupted.

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The following tutorial provides instructions to resolve the following error message in Microsoft Outlook: “Cannot start Microsoft Outlook. Cannot open Outlook window. Folders cannot be accessed. The server is unavailable. Contact your administrator if this occurs again.”.” Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be accessed. The server is not available.

Due to compatibility mode, Outlook sometimes cannot start. To resolve the issue, follow these steps:

The Outlook icon on your system freezes when you click on it for some time. This is a simple symptom that can help you figure out what’s wrong. When you try to login to Microsoft Exchange, you will receive a notice saying that you cannot start Outlook. You cannot open the Outlook windows or the Outlook folders. You have failed to log in.

Although Outlook is an excellent email client, it does have its drawbacks. In this article, you will find out how to troubleshoot Outlook Rules not working on your Windows 10 system. It’s not uncommon for users to report that one of Outlook’s most essential features called Rules isn’t working. (Source: Ledgeview Partners)

The goal of our article is to provide universal, easy-to-apply fixes for the “Cannot start Microsoft Outlook. Cannot open Outlook window.” error.

Microsoft Outlook is one of the most popular e-mail clients used by businesses and individuals thanks to its ease of use, integration with Microsoft Office, and ability to connect to Exchange.

Cannot Start Microsoft Outlook Cannot Open The Outlook Window

It is possible to try restoring the previous version of the Outlook file if you still cannot open the Outlook window and are experiencing the same error “Cannot start Microsoft Office Outlook” . Although you’ll lose some of your recent email and appointments, it seems like a better option than no Outlook at all. Simply click on the Outlook.pst file, click Restore Previous Versions, and then you’ll be able to open Outlook again.

The Set Of Folders Cannot Be Opened Shared Calendar

Users have reported that removing users from delegations or permission levels and adding them back again can resolve this error message.

Can’t Open Outlook

You can either press the Ctrl, Alt, and Delete buttons at the same time to open Task Manager if Microsoft Outlook does not open.

When using Outlook, users occasionally encounter errors, such as “Cannot open folder group,” which causes a hassle whenever they are trying to access their Outlook messages.

What is the cause of “Folder group cannot be opened”?

  • Outlook’s profile .xml file – Outlook.xml – is corrupt.
  • A profile file (.pst or .ost) created in an earlier version of Outlook and deleted or corrupted may also be a cause. Outlook may be running in compatibility mode or trying to work in compatibility mode.

How to eliminate the “Can’t open folder set” message?

Updated: March 2024

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Exporting your profile from the registry

  1. Type Regedit by pressing Win+R and clicking OK or Enter.
  2. Click the left-hand menu
    MicrosoftOffice15.0OutlookProfiles under HKEY_CURRENT_USER.
  3. Choose Export from the right-click menu when you are on the Profile key.
  4. Save the file as profile.reg in a safe location.
  5. Find and right-click on profile.reg, then select Edit.
  6. The file should be opened in notepad, where 15.0 should be replaced with 16.0 everywhere.
  7. Your changes will then be saved.
  8. You can now run profile.reg.
  9. If you wish to proceed, click Yes to see a confirmation message.

Deleting .xml files from the Outlook directory

  1. You can enter the path to appdata (Windows + R) or press OK (Windows + OK).
  2. Using the AppData directory, open LocalMicrosoftOutlook16*.
  3. Get rid of every .xml file that you find.

Launch Outlook as an administrator and turn off compatibility mode

  1. The Outlook shortcut can be found by right-clicking on it, and then selecting Properties.
  2. To disable compatibility mode, go to the Compatibility tab and select Disable.
  3. Now turn on the option Run this program as administrator and click Apply and OK to save your changes.

Restore the Office installation

  1. The Programs and Features section can be found under the Control Panel.
  2. Click Edit at the top of the Programs and Features window when it opens and select Microsoft Office.
  3. Once you’ve selected Quick Fix, click OK.
  4. The repair can be completed by following the instructions on the screen.

Launching Outlook in Safe Mode

  1. Then enter Outlook /safe by pressing Windows + R.
  2. You must disable your add-ons when running Outlook in safe mode by choosing File and Options, and then clicking Add-ons.
  3. Click Manage: Com-in Add, and then click Go.
  4. Save your changes by disabling all add-ons.

Creating a new Outlook profile

  1. You can open the Control Panel by pressing the Windows + S keys.
  2. On the next screen, click Control Panel.
  3. The Mail section can be found under User Accounts > Mail if you can’t find it.
  4. Select View Profiles from the drop-down menu.
  5. Then click the Delete button next to your profile.
  6. You can create a new Outlook profile by clicking Add in the Mail Profiles window.
  7. Your changes will be saved when you click OK.
  8. Complete the account setup process by selecting Automatic Account Setup or Manual Account Setup.

RECOMMENATION: Click here for help with Windows errors.

Frequently Asked Questions

  1. Create a new Outlook profile.
  2. Use a shortcut on the taskbar to launch Outlook.
  3. Make sure that you use a separate password for Outlook.
  4. Log out of iCloud.
  5. Reinstall iCloud.
  6. Do not install the cumulative Exchange Server update.
  7. Make sure you have installed the 64-bit version of Office.

The folder pane shows all folders in Outlook. If the folder bar is minimized, you cannot see your folders. Expand the folder bar by clicking the -> icon on the left side of the screen. Click View -> Folder Panel -> Normal.

  1. Click Folder at the bottom of the left pane in Outlook.
  2. Go to "Deleted Items" and click on the drop-down list to find your folder.

The Attempt To Log On To Microsoft Exchange Failed

It is possible that this error occurs when you have two or more Microsoft Exchange accounts linked to your Office 365 account. This error can be fixed by disabling Cached Exchange Mode in all but one account.

Click Open File Location. If you have more than one IMAP account, rename the OST file for that account. 3. Restart Outlook to recreate the OST file…

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Mark Ginter is a tech blogger with a passion for all things gadgets and gizmos. A self-proclaimed "geek", Mark has been blogging about technology for over 15 years. His blog,, covers a wide range of topics including new product releases, industry news, and tips and tricks for getting the most out of your devices. If you're looking for someone who can keep you up-to-date with all the latest tech news and developments, then be sure to follow him over at Microsoft.