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Please don’t include any personal information in your comment. Maximum character limit is 250. Thanks for your feedback. Outlook users getting error “Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. The operation failed.” usually indicates that the outlook data file, where outlook has all the information stored cannot be opened. Before going through the steps listed below, make sure that you are not running any back up software’s that is supposed to backup the data file, because if the
file is in use, then Outlook will not be able to access the file. Secondly, make sure that the file has not been moved from it’s original location. Add-in’s can also interrupt Outlook from accessing the data file. Method 1: Repair Corrupt System FilesDownload and run Restoro to scan and repair corrupt/missing files from here, if files are found to be corrupt and missing repair them and then see if you still get the error on Outlook. If you do, then try the other method listed below. Method 2: Reset Navigation PaneIn this solution, we will reset the navigation pane settings in Outlook. Close all applications.
Method 3: Start Outlook in Safe Mode
ABBYY FineReader, Broadcom Send-to-Bluetooth Intel Send-to-Bluetooth KingSoft’s PowerWord. Method 4: Repair Outlook Data FileOutlook stores data in data files, these files can be corrupted. Luckily, Outlook provides a tool called scanpst to scan and repair these files. Method 5: Enabling cached exchange modeThis method is applicable to exchange users only.
Method 6: Disabling Lync at StartupLync is a business version of the Skype application. Often, it interferes with important elements of the Outlook application. Therefore, in this step, we will be disabling Lync at startup and open Outlook again. For that:
If nothing works, then follow Method 3 until the ost or pst file reports no errors and then add a new profile. Once done, import your ost/pst file back into Outlook. Before importing, set up your account in Outlook and if you are missing messages or contacts, then import.
Kamil is a certified MCITP, CCNA (W), CCNA (S) and a former British Computer Society Member with over 9 years of experience Configuring, Deploying and Managing Switches, Firewalls and Domain Controllers also an old-school still active on FreeNode. How do you fix Cannot expand the folder the set of folders Cannot be opened the attempt to log on to Microsoft Exchange has failed?Following are a few effective solutions to fix the error “Outlook the set of folders cannot be opened” are as follows:. Launch Outlook in Safe Mode.. Update the Outlook application.. Recreate your Outlook Profile.. Turn off Compatibility mode in Outlook.. Repair Office Installation.. Fix Outlook.. Repair PST Using ScanPST Tool.. Can't expand the folder the set of folders Cannot be opened?The error “Cannot Expand the folder” has been witnessed by many Outlook users. The causes behind this might be a lot but can also be resolved without any complications. To begin with, make sure the folders are visible and within the limit range. Then, disable all the add-ins as well as the Cached Mode.
How do you fix the set of folders Cannot be opened?Fix “The Set of Folders Cannot be Opened” Error in Outlook 2016,.... Start Outlook in Safe Mode. ... . Create a New Outlook Profile. ... . Start Outlook from the Taskbar. ... . Use an App Password for Outlook. ... . Install the 64-bit version of Office. ... . Remove your Account from the Mail App. ... . Remove . ... . Repair Outlook Data Files.. Why can I not expand a folder in Outlook?Folder Limit
Microsoft Outlook has a limit of 1000 folders. If you have more than the specified number of sub-folders, the folder will not expand. That limit applies to Microsoft Exchange accounts. The folder limit is 500 for Outlook 2010, 2013, 2016, and 2019 versions.
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