Outlook users often face many errors while using this email client. And a frequent error faced by them is “Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. The operation failed.”
The actual reason behind this error is not known yet. Also, there is no specific solution to solve this error. However, there are some methods that can address this issue. Below we have mentioned the most effective ways to resolve this error. But, before using any method, make sure you’re not using Outlook.
One of the simplest methods to solve this error is to run Outlook in safe mode. In safe mode, Outlook starts without loading the add-ins. To run Outlook in the safe mode, follow this process:
Note: If it asks for account credentials, enter your password and choose “Accept.”
If Outlook works fine in the safe mode, then you’ll have to disable the add-ins. To disable add-ins in Outlook:
Now, restart Outlook and check if the same error occurs again or not. However, if you still face the same problem, then try other methods.
Your Outlook profile holds all settings of your MS Outlook. Sometimes, this profile gets corrupt due to some unexpected errors, and Outlook starts showing this error. So, try creating a new Outlook profile
After selecting the new profile, restart MS Outlook. And if Outlook starts normally, then the previous Outlook profile was corrupt. If you’re planning to remove the corrupt profile, make sure you create a backup for that profile.
All the data in Outlook, such as email messages, events, contacts, tasks, etc. are stored in data files (PST). However, these files often get corrupt due to various reasons. So, it can also be the reason behind this error. You can repair such files with the help of Inbox Repair Tool (scanpst.exe). To scan Outlook file with ScanPST, follow these steps;
Note: If you want to create a backup of this file, then check the checkbox “Make a backup of scanned file before repairing.”
The file will be repaired soon, and then you can import it to your Outlook. However, if you’re unable to repair the Outlook file with ScanPST, then use Kernel for Outlook PST Repair. It is an advanced tool that can repair any corrupt/damaged PST file quickly.
The navigation pane is the leftmost pane in MS Outlook; it contains all the folders of your Outlook data files and icons like Calendar, Contacts, People, Tasks. Resetting the navigation pane will remove all the customization of the navigation pane, and it can also solve “the set of folders cannot be opened” error. To reset the navigation pane in Outlook, run “/resetnavpane” command on your system.
If Outlook opens normally after running this command, then your problem is solved.
These are the most effective methods that can be used to solve the error “the set of folders cannot be opened” in Outlook 2016. In most cases, it is found that this error occurs due to corrupt data file or malware in the computer system. So, make sure your system is secured with antivirus.